Hi, same problem here on High Sierra, early 2011 MacBook Pro. Can't find any troubleshooting :/
Actually, it may suck, but you have to use 6.0.0 instead of 6.1.0 :D
atleast, that's what worked for me!
Thank you !Now it does launch but unfortunately, some of the most useful buttons (like "upload" or "new") don't respond ...I'll try again on the next mac I'll buy. This is so furstrating ! The software looks awesome and simple