At first Ihad some problems with license registration but I asked support and after few minutes and some proves, I managed to register successfully

Thank you, and the activation works correctly.

Key activation kept saying "You've hit your device limit". Support gave me 3 different keys, and it finally worked.

Had some issues with activation, but they were resolved thanks to Vincent. Thank you!

For anyone having trouble activating it, you have to download the linked version of Malwarebytes, never versions don't work.