I think I found a solution, also it worked for me too so try this:
Do
Windows Key + R
and paste -"%LOCALAPPDATA%\Programs\Opera GX\launcher.exe" -uninstall
(with the -uninstall, don't delete anything)Make sure that Delete my Data is UNCHECKED and uninstall the app.
Download an old offline installer from the links - 64 bit OR 32 Bit:
x64 - https://ftp.opera.com/ftp/pub/opera_gx/73.0.3856.438/win/Opera_GX_73.0.3856.438_Setup_x64.exe
x32 - https://ftp.opera.com/ftp/pub/opera_gx/73.0.3856.438/win/Opera_GX_73.0.3856.438_Setup.exeDisconnect from the internet and run the installers
Do
Windows Key + R
and paste -"%LOCALAPPDATA%\Programs\Opera GX\73.0.3856.438"
From there delete the
opera_autoupdater.exe
, and do the same from73.0.3856.438_0
or similar if they existRun Opera GX normally