CS5 Extendet auf Catalina IOS möglich?

Tip: iOS is for iPhone and iPad only. Macs use Mac OS, not iOS.

no, it's not possible for most adobe cs5 extended programs.  photoshop is an exception and there may be a few others (eg, premiere) that you should check to see if they have 64 bit versions.

catalina was the start of apple's os'es that stopped supporting 32 bit programs (adobe's and everyone else's).