While most users install via the Steam Workshop, the .zip file you mentioned is likely used for:
: It is highly valued by players who run massive colonies or those who utilize the Ideology and Anomaly DLCs, which introduce diverse pawn types like slaves and ghouls. Compatibility (Mixed) : File: SlaveBar_v1.3_M.zip ...
: For large colonies, it prevents the colonist bar from spanning the entire screen width by grouping "non-colonist" pawns into their own selectable tabs. While most users install via the Steam Workshop, the