The add-on is Resource Manager (XFRM) v2.2.5 or depend on which version of Xenforo you are running. v2.2.5 is available here on xnforo.ir - But you may want v2.2.4 or older.
Make a backup of your LIVE/WORKING forum first, or install to a TEST forum, then setup XFRM.
Upload/Copy Resource Manager (XFRM) files to correct folders of xenforo forum.
Add some TEST files to your Resourse Manager, Then make sure you have correct permissions for Admin or User level
That I can remember thats it really, so you will need Resource Manager (XFRM) and version to suit your xenforo version.
Then follow my older post with image attachment to make your own feature resource.
hope this helps