Assuming you're referring to the contents of the Images folder in this repo, then here's a way. It's not pretty or reusable, but it'll work:

1) Open up terminal and cd into the folder you want to save the images in 2) Paste in the code at the bottom of the answer and hit enter.

Essentially what this does is it first creates an images forlder in the folder you are currently in, and navigates to it. It then loops over (hopefully) all the images in the folder on Github and uses CURL to download them.

mkdir images && cd images && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/aldrin%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/aldrin%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/anders%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/anders%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo10%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo10%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo11%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo11%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo12%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo12%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo13%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo13%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo14%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo14%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo15%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo15%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo16%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo16%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo17%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo17%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo1%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo1%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo7%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo7%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo8%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo8%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo9%402x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/apollo9%403x.png && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/armstrong%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/armstrong%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/bean%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/bean%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/borman%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/borman%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/cernan%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/cernan%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/chaffee%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/chaffee%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/collins%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/collins%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/conrad%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/conrad%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/cunningham%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/cunningham%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/duke%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/duke%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/eisele%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/eisele%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/evans%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/evans%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/gordon%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/gordon%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/grissom%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/grissom%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/haise%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/haise%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/irwin%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/irwin%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/lovell%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/lovell%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/mattingly%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/mattingly%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/mcdivitt%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/mcdivitt%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/mitchell%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/mitchell%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/roosa%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/roosa%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/schirra%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/schirra%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/schmitt%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/schmitt%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/schweickart%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/schweickart%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/scott%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/scott%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/shepard%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/shepard%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/stafford%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/stafford%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/swigert%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/swigert%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/white%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/white%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/worden%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/worden%403x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/young%402x.jpg && curl -O https://raw.githubusercontent.com/twostraws/HackingWithSwift/master/SwiftUI/project8-files/Images/young%403x.jpg

EDIT: If you want it as a zip you can then just zip up the images folder created by the above script :)

Let me know if it helped :)

EDIT 2: Just realized the project 8 folder is part of a big Hacking with Swift repo that contains the assets for all the Hacking with Swift projects, that's why it can't be downloaded individually. A better approach than what I said above might be to just download a zip of the whole repo from here (use the green "Clone or download" button, then click "Download ZIP"). This will download the files for all the projects.