How to activate Otto Pro

First of all, thanks for buying Otto Pro. Your license key has been sent to your email. Copy the key → Open Otto's popup → Click on the last icon (outlined icon of otto) on the header → Put the key in the Input field and click Activate.

If I buy Otto Pro once, do I keep it forever?

Well...yes. You buy Pro license once, you can use it forever

I uninstalled Otto (Pro). Do I have to buy the license again?

No, if you buy a license once you get to keep it forever. You can find the license in the email receipt that was sent to you when you bought it. If you can't find the email, you can email me at help@ottoapp.me