So excited, I downloaded and installed it for my Mac (High Sierra), which it upgraded itself from Lazarus 2.0.11, ran my project and got told:
"cocoagdiobjects.pas(11,34) Fatal: Can't find unit CocoaGDIObjects used by CocoaPrivate"
Not a great start.
EDIT: Followed the instructions to completely remove Lazarus, then started again. Same error. Gone back to 2.0.11, which works fine.