updating software for an old Mac
I have a mid 2011 21.5" Mac using High Sierra. I want to install Catalina. I have 8 GB of memory. If I upgrade to 16 GB (that's the max for this device) will that work or is there another issue preventing me? I'd prefer to keep my Mac if possible as my computer needs are pretty basic and it still looks great. I do, however, need newer software in order to use Turbotax next year.
iMac 21.5″, macOS 10.13