How To Tell Which PC Has Malwarebytes Premium in Malwarebytes for Windows Support Forum Posted October 9, 2018 On 9/12/2018 at 3:17 AM, Firefox said: Hello and Welcome! Try going to the My Account Page and create an account with the same email address you used to purchase your Premium and it should show which PC its installed on. Depends on what license you bought, if you bought a single or multiple PC license. If its a single then you can only use it on one computer. Sorry for late reply - couldn't log in using old version of Firefox. Now using Chrome. Anyway, I found out which device was the premium - quite easy really: just run it and see what it says at the top of the window! Only one device says "Premium". One says "Premium Trial", the phone says "Premium trial has expired", and another PC says nothing about Premium.