They have changed the filenames and installation instructions since:

dlssg-to-fsr3 has been tested in Cyberpunk 2077 and The Witcher 3 only.

dlssg-to-fsr3 may be obtained from: https://github.com/Nukem9/dlssg-to-fsr3

================================ ===== Install instructions =====

1. Right click on “DisableNvidiaSignatureChecks.reg” and select “Merge”. Click “Yes” when the dialog opens.

2. Locate your game’s installation directory. For Cyberpunk 2077, this would be the folder containing Cyberpunk2077.exe.

3. Copy “dlssg_to_fsr3_amd_is_better.dll” and the new “nvngx.dll” to your game’s installation directory.

4. Done. Launch the game. You’ll see a message box on startup.

================================ ==== Uninstall instructions ====

1. Right click on “RestoreNvidiaSignatureChecks.reg” and select “Merge”. Click “Yes” when the dialog opens.

2. Delete “dlssg_to_fsr3_amd_is_better.dll” and “nvngx.dll” in your game’s installation directory.

And there is already a mod that replaces Nvidia Frame Generation with FSR3 in games like Cyberpunk 2077, The Witcher 3 and others: https://github.com/Nukem9/dlssg-to-fsr3/releases

Has anyone gotten this to work in Linux/Proton?

I guess that’s a bit better than the original command in question. But from what I understand it’s still unnecessary and there is simply no need to force the refresh. A regular pacman -Syu is all you need and will refresh all databases that need it.

You could install the linux-lts kernel alongside the one you have already installed to have the option to just boot into that one when a kernel update seems to be the problem.

Another thing would be to look into backup solutions that execute automatically when updating your system. Personally I have my system on BTRFS subvolumes and a package called snapper to manage the snapshots (backups). Alternatively the package timeshift gets mentioned a lot when discussing backup solutions.

Otherwise you did exactly what I have done to fix almost every issue I ever had. Downgrading the likely culprit and updating again a bit later.

Very basic, but incredibly useful. Love it.