Light Room Upgrade Older iMac
I have 2009 (late) iMac 21.5 inch 4gb. I am not allowed to upgrade to light room because I don't have the latest OS upgrade which they say is Catalina. Is it possible to change to 8 or more gb, and then get Catalina? Also change hard drive maybe? I am trying all options before I have to splash the cash.
Any help and or advice is appreciated.
Thanks people
iMac, macOS 10.12