There are 2 ways to register you Zoiper to a pro licence.

1st is when you launch Zoiper, you may see the following screen. If so click Activate Pro Licence.

Enter the supplied Zoiper Licence Username and Password as supplied by us and click Activate online.

If in the past you have clicked the continue as Free User, this box may not appear at start up. In Zoiper, click the cog to get to settings.

Click the orange Activate Pro

Enter the supplied Zoiper Licence Username and Password as supplied by us and click Activate online.