I apologize for the trouble!
If you’re running into this issue please download Local 5.0.6 here and re-run the installer: Local 5.0.6 (Beta)
Do not uninstall Local prior to running the installer. The installer will handle the upgrade.
If the issue still persists, please try running the 5.0.5 installer which can be found here: Local 5.0.5 (Beta)
I can assure you that we rigorously test every release that goes out. In fact, every time we commit code it goes through a set of tests that verify functionality including (but not limited to) adding sites and deleting sites on macOS, Windows, and Linux.
Also, before any update goes out to the forums or auto-updater members of our team manually test Local on macOS, Windows, and Linux to make sure our automated tests didn’t miss anything obvious.
I know how frustrating experiences like this can be but my simple ask is that you provide constructive information such as screenshots, screen recordings, log files, and so on so we can best help you. Attacks like this don’t help anyone.