The libraries used for import/export are only compiled for Windows x64. This add-on will not currently work on other OSes. Files > Import > PSO2 Model Search opens a window to find an import items by ...
the releases available on release pages are only for older version (below 5.0), access on link below the gpv2 branch (blender 4.0 to 4.2) is no longer maintained. bl42to45 branch (blender 4.3 to 4.5) ...