Start a subscription to upgrade your free account and unlock all courses and lessons in the app. Choose subscription length and specify your e-mail adress used in the app before hitting the Buy Now-button. The secure check-out is provided by PayPal:

Choose subscription:

Your e-mail:

You will receive an e-mail when your account has been upgraded to full access - this may take up to 24 hours. Your subscription time period will start from when you receive the e-mail.

After the time period has ended your account will be reverted back to only access the free courses and lessons. But stay calm - all your personal study progress is still saved in the app. Just start another subscription period to access all content and study progress again.

Questions? Contact us

Good luck with your studies! /The Doctor Professor team