Due to having an older mac, I'm stuck on High Sierra, cannot upgrade beyond that. Previous versions of Tic-80 worked fine and my machine is plenty fast to handle it but this newest version (both pro and regular) say that 10.15 is required. Is there any way around this?

Same issue here :-(
I'm stuck with Mojave and can't use the newest version. What a pity...
And just for Tic80 I don't want to update to 10.15 because I've got a plenty of other Apps I'm using which won't work anymore then.

I updated all the macos builds, thank you for the help.