will upgrading from 10.9.5 to 11.0.1 interfere with my current version of photoshop?

Hi nappyfs,

welcome to the Apple (user-to-user) Community.

Re: "will upgrading from 10.9.5 to 11.0.1 interfere with my current version of

photoshop?"

Am no expert, yet seems the answer is most likely "Yes".

We do not know which version of Photoshop is installed on your Mac.

Any apps on MacOS Mavericks 10.9.5. would likely be 32 bit apps,

Whereas apps on macOS Big Sur 11.0.1 need to be 64 bit apps to be compatible.

This online (non-Apple) article may help answer your question more completely:

Photoshop, Apple Silicon, and Big Sur | macOS 11 - Adobe H

Eg: says: "Unsupported versions of Photoshop were not designed or tested to work on macOS Big Sur (version 11) or Apple Silicon M1 processors".

All the best :-)