Based on the Tips from the god blessed William Vaughan, i've turned back the Item Button into the Modo's 12 release, as a simple Modo Plugin Package that you just have to drag and drop into Modo when it's running.
Of course with the recent UI change in Modo 12, you've lost the item button (and info state). Now is back
Fixed installation issue wen drag and drop into Modo 12.0 and 12.1 recent release.
Remember to Delete the Folder of the Kit, under C:\Users\**YOURNAME**\Documents\Luxology\Content\Kits before drag and dropping that new LPK file into Modo.
Best regards, Franck (aka Smoluck)