Wow. A password generator. How useless. Go to this page for releases.
Very simply run PasswordGen.exe for Windows. The PasswordGen.exe is in the release.zip, which is in the releases page shown above. For Linux, macOS, etc, Download python, download the source repo (use git clone https://github.com/KiaWeb/PasswordGenerator.git) and run python3 main.py to run the python script.
Also, this is the BSD license, so anything you do with it, give credit saying GitHub/KiaWeb.
- Kia