Same thing happened to me today. I installed the update and everything disappeared, even with search. I downloaded from the link above and rebooted and that didn't work either. Finally I went to the Website and downloaded the installer again (looked like the same one) but when I installed this time it started over and then rebooted again and Malware reappeared. Disappointing experience with Malwarebytes after a year of no problems. Hope they do more testing on their install process. Here is the page I just used on their site to get the latest download. https://support.malwarebytes.com/docs/DOC-1141
Appreciate all the comments above from people who had the same problem.