I'm using an ancient Canon Selphy photo printer... on Windows 11 without any issues. Using the Windows 7 64-bit driver, worked basically out-of-the-box. It's definitely not officially supported, but to date it works totally fine.
Huh, interesting. Is the driver built in to Windows, downloaded from Canon, or acquired some other way?
TBH the web app story on Windows isn’t ideal anyway because you have to install Zadig before it will work.
I think I downloaded it from Canon 5-6 years ago. It should still be around I guess, but I can share it if needed.
EDIT: you can find it here for example: https://asia.canon/en/support/0100304802