There are some details of what is RECOMMENDED MINIMUM - please don’t shoot the messenger.
you milage may vary but OPENGL V3.0 is a requirement that gets more and more use as updates roll out to roon so this could be where the hardware is no longer up to snuff.
You will have to move with the times I think. Maybe try the RoonServer version (this has no OpenGL dependancies) and access it via remote clients like iPhone/iPad/tablets etc
The update worked for my 2010 Mac Mini on Yosemite, but as @wizardofoz suggests, I am using Roon Server which likely reduces the computing requirements significantly.
I’m just a user like like you, but I’ve tried a lot of servers to run roon, and you are using a much less capable machine than Roon recommends. But hey you can roon server without the gui and you might get it going.
By all means see what roon support will say, but pretty sure it’s a graphics capabilities issue.