In Krita open ''Settings'' click on ''Manage Resource Libraries...'' in the opening dialog click on ''Import'' then, in the next opening dialog, browse to the bundle you want to install, select it and confirm the selection, so Krita can import the selected bundle. 
It may be needed to activate the bundle after you imported it this way, the button to activate/deactivate a bundle can be found beside the import button, but usually it will be active after import.


Happy Painting !



 