How to activate/upgrade license/plan with activation code

This tutorial goes through the steps to activate/upgrade using activation code. You usually get the activation code when purchasing product that comes with the software license, for example FPVSIM Timer with App license.

Once logged in to FPVSIM, open the side menu, and click on the "Account" link at the bottom.
Entry link for FPVSIM account page.
On the account page, input activation code and click on the "Activate" button.
Input authorization code on the FPVSIM account page.
If the code is valid and hasn't been used before, you should see a success message and your plan being changed to Pro.
Upgraded to FPVSIM Pro plan.

Note that once you upgrade with activation code, you can still downgrade or upgrade to other plans. Each activation code can only be used once.