However, Malwarebytes has changed its distribution methods over the years:
A: No. The classic portable .exe is for Windows only. Malwarebytes for Mac has a standard installer, not a portable version.
If you do not have access to the official TechBench Toolset, you can still use a USB drive to assist in cleaning an infected computer via a "sneaker-net" method:
: A specialized, portable tool used to detect and remove deeply embedded rootkits. It is downloaded as a ZIP file, extracted, and run directly from the desktop or a USB drive. AdwCleaner
Copy the .exe setup file to your USB flash drive.