The latest version of the VLFT Gamification can be downloaded here
Unzip it and move it into the applications folder, after that right click->open. If a window pops up with a text that you can not open it because the developer cannot be verified, then click close, and right click again->open.
After that it should start and a window should pop up ascing for permission. Click Open System Preferences and with the + icon grant it permission for keystrokes and grant it full disk access.
After this, you should be able to use the application.