Just licensed my Glyphs 3, installed some plugins from plugin manager and Remix tools, after that I reopened app and got this message:
Glyphs 2 works as good as before
What can be the reason?
If you typed 'pip" it should have been “pip3” to install the correct version.
Glyphs 3 requires Python 3.8 or later to work properly.
How can I install it 
is there any command for terminal to do that or what could I do?
It can get complicated. Someone else would be better qualified to help you with that.
I had the same python but app was working normally today morning, I don’t think it’s the pithon issue…
You can install The Python 3 runtime packaged for Glyphs from within the menu Window > Plugin Manager. Select the Modules tab, and then Install next to where Python is indicated.
You can also select the installation of Python to use via Glyphs > Preferences > Addons
This is also described in the Extending of the what’s new in Glyphs 3: Making Things You Love post.
Also note that some plugins still need to be updated for Glyphs 3. To start Glyphs without loading plugins, hold down the Option and Shift keys. Some info about that is in the Crashes tutorial.
Thank you so much for detailed answer. I was able to start the app while holding Option and Shift keys.
I have installed Python3 via plugin manager as you mentioned and than changed the use of Python:
And it works!
Thank you so much!
Also having the problem, after it crashed (I think while compiling features), it now asks to reopen or not, but no matter what I choose it crashes after showing the licensing window for half a second.
Tried, with no result:
removing Glyphs 3 folder from Application Support
removing com.GeorgSeifert.Glyphs3.plist
running with option + shift
reinstalling the app
Could you please help?
Can you drag the license onto the closed app?
Using a trial for now, but now it actually closes after showing for a second whether I want to check for updates, I guess that changed after removing the preferences.
I tired the same and for me is does work. Did you restart the mac?
Accidently noticed com.GeorgSeifert.Glyphs3 folder in Application support, removed it too and it works after restart!
