"Multi" refers to the multi-language support (English, Russian, French, etc.) included in the package. Pros & Cons How to install (most of) CS6 on Windows 11 without errors

Dual support for 32-bit (x32) and 64-bit (x64) systems.

: The inclusion of both x32 and x64 versions is valuable for compatibility; the 32-bit version allows for the use of older legacy plugins, while the 64-bit version can utilize 4GB or more of RAM for handling large files.

You can often run the portable version alongside newer versions of Photoshop (like CC) without conflict.