Hi, if you take a look at the System requirements section of the Keylogger page, you can see that you must have Windows 10 and .NET 5 installed in order to run this program. I don't know if it works on Windows 11 and I cannot guarantee it.
If you're having problems with .NET 5 installation, take a look at your installed apps. If there is any .NET installations already, I suggest uninstalling them first and then installing it again using the popup that opens with Keylogger (or link from the System requirements section).