Instalation from Developement branch - 50thomatoes50/blender.io_mqo GitHub Wiki
You should do this only if you need latest features.
The main branch is even more unstable than releases
- Download ZIP of the repo

-
Open the zip file and open the folder
blender.io_mqo-master -
Open an explorer windows and go to your blender addon folder
You need to find the correct version of blender
Windows: %appdata%\Blender Foundation\Blender\2.81\scripts\addons\
Linux: /home/$user/.blender/2.81/scripts/addons
Mac: /Users/$USER/Library/Application\ Support/Blender/2.81/scripts/addons
If the last two folder doesn't exist you need to create them
-
Now Drag the folder
io_scene_mqointo the addons folder -
Open the corresponding blender version and active the addon