:Installation Method A:

0- Requires "Python Plugin Importer" script to be active
1- Tools > Scripts > Import Python Plugin
2- Browse for Zip file > Open



:Installation Method B:

1- Open the resources folder for Krita:
Settings > Manage Resources > Open Resources Folder
2- Head to the Python Folder called pykrita:
krita > pykrita
3- Place the unzipped folders inside