Unpack the archive and put the "ultrawide" (for 21:9) or "superwide" (for 32:9) folder in "mods" within the main game folder.
Launch the game and enable the mod by checking its box
Quit the game
Open %USERPROFILE%\AppData\LocalLow\Nolla_Games_Noita\save_shared\config.xml in a text editor and change internal_size_w="1280" to internal_size_w="1707" (for 21:9) or internal_size_w="2560" (for 32:9)
Launch the game again - the mod should be working now!
Tested on the latest Steam version at 2560x1080, 3840x1080, and 5120x1440.
You can buy me a coffee. Mod mirrored here.
