Plexconnect theme help on windows

I was trying to install the themed version from this thread https://forums.plex.tv/discussion/100363/new-library-view-layout

But if I switch the main layout to “grid” to see the actual themed version, my plex server hangs on

serving /js/sectionHoldSelect.js

Any tips? This all worked great on my old mac mini but I’ve just upgraded to an old dell server and for some reason getting this going is not working. Thanks!