This neat script provides a little fake API to unlock all premium/enterprise/enterprise+ (here called ultimate) features of your own Pritunl VPN server. If Pritunl wouldn't be mostly free already, you could call this a crack. An Open Source crack.

Take a look into the server folder: You could use the Pritunl source there (or just download this specific version from their GitHub repo) to compile a guaranteed compatible version for this API or just download any other version of the Pritunl server and try your luck. Then you'll need to execute the setup.py script (preferable as root, as it needs to modify the Pritunl files directly). After that log in into the dashboard - there should be a "Update Notification":

Now try to enter any serial key for your subscription and just follow the hints/notes if you enter an invalid command:

A valid command would be bad premium or active ultimate:

If everything worked, your subscription should now look like this:

Make sure to support the developers by buying the choosen subscription for your enterprise or company!

This is optional. You can simply use the default instance of this API (host is noted inside the setup.py script) and profit from "automatic" updates.

Just transfer the www files inside a public accessible root-folder on your dedicated Apache webserver (really everthing with PHP support works). Also make sure your instance has a valid SSL-certificate (Let's encrypt is enough), otherwise it may won't work. An example Apache install process can be found here. If you want to test your instance, just open the public accessible URI in your browser and append /healthz to it - if you see some JSON with the text, then everything worked!

• This modification will also block any communication to the Pritunl servers - so no calling home :)
• SSO will not work with this api version! As Pritunls own authentication servers handle the whole SSO stuff, track instance ids and verify users, I won't implement this part for privacy concerns (and also this would need to be securly implemented and a database).
• This api has also its own docker image. Take a look into the docker folder and enjoy!

Have fun with your new premium/enterprise/ultimate Pritunl instance!