There isn't one, this is from the release notes in the first post,
This release is limited to users updating from Malwarebytes Anti-Malware 2.1.4 or greater to start, so we don’t have a direct download link to share right now.
I got the 2.18 update on one of my three computers today - but the other two (running same Malwarebytes license) did not. All are continuously connected to internet.
Do you think these will eventually get automatically updated or is the program only seeing (aware of) my first computer?
EDIT: to answer my own question, I just noticed that the second computer had the "update available" symbol so I updated it. One more to go.
It just looks like the updates are coming a different times for each computer - but they are coming.