Prerequisite
- Malwarebytes online installer v4.5.3.263 or newer. Note that this is only available by enrolling in beta at the moment I am writing this. It gets downloaded in "C:\ProgramData\Malwarebytes\MBAMService" under a folder which name begins with "In". Copy it somewhere readily available.
Steps
- Uninstall Malwarebytes normally or via Support Tool;
- Run Malwarebytes online installer with undocumented command line option to install beta program directly*;
- Try activating license either via providing the key or by logging in, both activation means reproduce the problem.
Note (*)
I am aware this is unsupported and probably only Malwarebytes developers are supposed to know how to do this step, but this will become a real issue if/when Malwarebytes v4.5.3.162 CU 1.0.1579 hits general availability.