SMP unfortunately only has a x32 version. I would also prefer to use x64 but... so tired of asking for a x64 version instead of a completely new component.
Not joking, I would pay if anyone makes a simple port of SMP to 64 bits.
The check is for strings, but the setting is a boolean (true). Looks like a copy/paste error on my side (you can just ignore it, since all is right).
Line 78 at 'main\playlist_tools\playlist_tools_menu.js'.
To stop the popups, change this:
bMultiple: ['Partial Multi-value tag matching', true, { func: isStringWeak }, true],
To this:
bMultiple: ['Partial Multi-value tag matching', true, { func: isBoolean }, true],
Let me know if you need more guidance to use the skip tag thing. You need the button 'Playlist tools' which I presume you added per your error and at Scrip integration check you have the skip menu entry (which I think is enabled by default).
Then, you will have the menu entry available for DUI/CUI buttons like my gif.