How to, by using module Profile2 Registration Path, the user's account becomes active after it is activated by the administrator. The administrator should get email when user creates new account.
I don't think you need a contrib module for that. You can set " Visitors, but administrator approval is required" under "Who can create accounts" on
As for sending e-mail, create an advanced action at
admin/config/system/actions and then set it on
admin/structure/trigger/user to be triggered by account creation.
The core Action and Trigger modules are all that are required for that.