Version 2.5.2 (1171)

Is this beta release compatible with Mac os High Sierra

Regards

I am running it on High Sierra. So, yes.

It should be working fine on 10.9 to 10.14.

Thank you both for the reply running it on macOS High Sierra 10.13.4

You should install the latest security updates from Apple (10.13.6)

I currently need to run 10.13.4 so what security updates does Glyphs require.

Regards

Glyphs does not require it but it is not a good idea to run a system that is not fully updated. But you seem to have your reasons. Just be careful then.