"Failed to create game client window." Fix: Run D2VidTst.exe (in the portable folder). Choose DirectDraw (2D) or Direct3D . The portable repack sometimes messes up the initial video test.
For single-player mods (e.g., PlugY for infinite stash, Eastern Sun ), 1.13c + portable setup works perfectly. diablo+2+lod+113c+portable+fitgirl+repack+full
PlugY works beautifully with 1.13c portable and requires no online activation. "Failed to create game client window