Quote:
"Malwarebytes Anti-Malware is available for users of any modern Windows client to download and install at no cost to them. They can also purchase an annual subscription, which entitles them to take advantage of real-time protection, scan/update scheduling, access policies, and the ability to utilize all of these features
on up to three computers under the same license"
Source:
https://www.malwarebytes.org/support/guides/mbam/
(It's under 'Activation')