Catalina Patcher for Macbook Pro Mid 2010

Maybe you could post a link.

Macbook Pro Mid 2010 does that have the metal capable hardware.

https://www.apple.com/macos/catalina/

macOS Catalina - Technical Specifications - Apple Support

https://support.apple.com/kb/SP803?locale=en_US

System requirements macOS 10.15 Catalina

macOS Catalina will run on all Macintosh computers that supported Mojave:

MacBook: Early 2015 or newer

MacBook Air: Mid 2012 or newer

MacBook Pro: Mid 2012 or newer

Mac Mini: Late 2012 or newer

iMac: Late 2012 or newer

iMac Pro

Mac Pro: Late 2013 or newer; Mid 2010 or Mid 2012 if upgraded with a recommended Metal-capable GPU

Define “safe” and “stable”. The “downside” is that parts of Catalina will not work properly. I don’t know the details of the patch, but the fact that it exists means that some features aren’t going to work. I don’t know what those features are or whether they would be show stoppers or not. There is also no guarantee that the machine won’t stop working entirely one day.

Why do you want to upgrade anyway? The only reason to upgrade would be to get new features. But you already know that some of those new features won’t work properly. It seems you stand a good risk of losing more than you gain.