OS is Linux Mint 18.3 and I am pretty much a Linux noob.
I managed to get the Unsupported App Store installed with Webtools 3.0. However, IceFilms is no longer listed among the apps I can install through the UAS. So I went the manual route. Downloaded the zip file, extracted it, renamed folder so that it's just "IceFilms.bundle". After some noob struggling with folder permissions, I was able to get the IceFilms.bundle in the plug-ins folder without any "X" indicators next to folders. After restarting Plex, IceFilms now appears in the Plug-ins list.
However, there is no content showing up. Most (though not all) of the other plug-ins are showing content. So I am wondering if something is still amiss with the IceFilms installation. The folder permissions are identical to other apps that are retrieving content. What should I be looking for?