I can't upgrade and buy a PRO license - what's wrong?

If you click on the Upgrade to PRO button, a separate window should open hosted by payment provider Stripe that allows you to buy the PRO license. If this isn't happening, then please check the following items:

• Is a pop-up blocker blocking the payment window from opening?
• Try with another browser
• Try with another device, i.e., mobile
• There are 3 buttons to upgrade, one on the homepage, one on the calculator page, and one in Settings. Try either.

If all of this isn't working, then please contact us (again) and let us know which button isn't working and what browser and device you are using.