The keyword "v108" likely originates from:

: Download the .zip file (do not extract it), go to Edit > Preferences > Add-ons , click Install , and select the file.

Simplicage Pro is a third-party add-on designed for Blender that focuses on . While Blender comes with built-in decimation modifiers (like the Decimate modifier), Simplicage Pro automates this process with greater control, preserving UV maps, vertex colors, and shape keys while drastically reducing polygon counts.

Many websites claim to offer v108 for free when it is actually a paid "Pro" version.