Need to download canon lbp 2900 patcher for OS Catalina- can somebody help me?

Hi art.design79,

Thanks for posting. I see you have a question about printer software, and I'm glad to help.

Generally speaking, your macOS updates should include software/drivers for any compatible printers: Update printer software on Mac. I did find this resource from Canon that lists compatible operating systems and it doesn't list any macOS versions as supported: Canon i-SENSYS LBP2900B.If you're not finding drivers for your printer by updating your macOS software as shown in the link above, you may want to get in touch with Canon directly: Welcome to Canon Support

I hope this helps get you started. Take care!