The GitHub repo is here: https://github.com/Vectorial1024/v1024_civilian_fleets

How to download from there? It is simple:

1. Enter the repo
2. Locate the green "clone or download" button on the right side
3. Click on the button
4. Click on the "download ZIP" button
5. Wait for the download to complete
6. Extract the ZIP file
7. Move the extracted folder to /extensions folder of the X4 installation
8. *IMPORTANT* You notice the "-master" in the folder name? Delete them, so the folder name becomes "v1024_civilian_fleets"
9. Done!