It sounds like you’ve come across a file name for a repack of Malwarebytes Premium, likely from a torrent or warez site.
7-Day Free Trial: You can download the official version and get a 7-day free trial of all Premium features. Malwarebytes.Premium.v5.1.8.RePack.by.xetrin-So...
Which of those would you like?
Malwarebytes Premium v5.1.8 RePack by xetrin-So...: Comprehensive Guide It sounds like you’ve come across a file