@alphamachina: I also ran DISM, SFC /scannow and tracesxs (ran Opera installer during the trace, got the log, ChatGPT says the log is clean). I also completely reinstalled all Microsoft redists 2008 - 2022, x86 and x64, and used Crystal Disk Info to check my system drive to make sure it wasn't failing. I'm at the end of my expertise. Either something is wrong with this installer, or I'm missing something.

@alphamachina: I even deleted everything at the following locations and still get the corrupted .pak error when trying to install the latest version of Opera. The funny thing is the last version of Opera One (before it tried to update) runs just fine, if I go run the opera.exe directly from that folder.

%LocalAppData%\Programs\Opera
%LocalAppData%\Opera Software
%AppData%\Opera Software

When Opera first tried to update to this version, I got "The operation has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more details."

And when completely uninstalling Opera (wouldn't uninstall, as the install was corrupted) I had to use CCleaner to remove Opera and its registry entries from my system. But now every time I install Opera, the browser seems to install just fine, and even opens, but then I get an error, "At least one file with resources (.pak) is corrupted. Please reinstall Opera."

I have tried everything I can think of to fix this. What the hell is going on?

@WarlockTheWeary I'm having this exact same problem even today on the latest version of Opera One. I finally found out what it was in the settings and disabled it. It's only applying the sharpening feature across the same amount of video as the image posted above by Warlock.

I'm running on a 2560x1080 ultrawide monitor, 3080 Ti with the latest Nvidia game ready driver.