Mekkablue script don't appear after installing

I have just installed Mekkablue scripts and applied command: Reload Scripts (Cmd-Opt-Shift-Y), but it still doesn’t appear in my trial Glyphs 3 version.

I noticed that Glyphs - Settings - Add-on: Pyhon version is empty. I have just downloaded and installed 3.10, reloaded Glyphs, but still can’t see it in the list.

Can you please let me know what I am doing wrong. I am pretty new with it.

How did you install the scripts? Through the plugin manager?
And I would also recommend to install python from the plugin manager. You need to restart Glyphs after installing the python Modul and the select it in preferences and restart again.

I have just removed Python from plugin manager and reinstalled. After reloading Glyphs everything is working fine. Thank you!