Hello!
Sorry you've been having problems with the installation.
Easiest way to get it up and running would be to download the latest client from: https://beta.freeso.org/latest
You can then extract it into a folder named FreeSO and run FreeSO.exe. If you want the launcher to run it from there, click on FreeSO in the INSTALLER tab, and choose the directory where you extracted it. It will detect that it's there and set it as the main FreeSO directory.
Let us know how it goes!