I have an older Mac Pro that was given to me. It worked but due to unknown password I could run anything of value. I might add it also had XP on it. After trying Zorin on my win 10 machine I decided to try it on the Mac. I could not select the Mac to download anything so I downloaded on my Win 10 onto a 32 G jump stick. I then used the jump stick and was able to get Zorin to operate except:
No Mouse touched pad mostly worked.
Most of the time it boots with a black screen with blinking curser on upper left and just sits there.
Ps I tried putting Win 10 on machine after Zorin was installed but could get the CD to boot as I could not select boot option from keyboard.