For the installation the procedure is the expected one and once the package is installed the fuctionality is immediately available. Here are the two different ways to install the package:

Set up the user groups

The plugin has only one field that allows the administrator to set which groups will have access only to the restricted folder. It should be self explanatory, select the groups that users belonging to them will NOT access the full images folder but rather their own folder named as their own user name in a path like images/users/{hased(username)}.

Restricted Joomla Media Manager

It goes without saying that any selected User Group need to have the permissions adjusted in the Media: Options.

Joomla Media Manager Permissions