Concerning the Blaukovitch/Mozilla_Firefox_135 Windows_7/release mod I got a virus reading on the kernal64.dll use in the mod, Trojan:Win32/Phonzy.B!ml. Otherwise it worked in my Windows 7 x64 ultimate.
Thinking first time was too small & 2nd was large enough if you enlarged it. 1st shows error occurred when trying to install/update Edge on a Win7 machine & 2nd shows version of Win7 machine. Edge & Chrome quickly dumped Win7 after M$ dumped it. I don't think it is you who are confused. ;>)) Tell @alzcoew397 to install FF or upgrade to Win 10/11...
I would never install random forks of browsers "for Windows 7" from somebody with a random name on Github.