I want to avoid getting blacklisted so I decided to register my gf's gmail account. Now I got my second license key. @_CyberGhosT_ is absolutely right. Thanks for the good advice, man!
Okay, thank you very muchIt may work on more than one, but I think it wise to register that PC as well and do a fresh key and download.
The keys are meant for one PC there is a good chance that using a key on multiple devices will get it blacklisted.
If you need proof please email Zemana Support so you know I am not guessing on this one.