Nothing is missing or wrong.
Of course it still isn't working.
The plugins do not work on iOS8.3 and above.
Do you want the technical details?
Apple has restricted access to the VendContainer app storage, which the plugin needs to access to work (as that is where Marvin stores the database and stuff).
Unless you use the jailbreak fix mentioned a few posts ago, you are stuck until and unless @Kris (the maker of Marvin) updates Marvin to provide the necessary info in user-accessible storage.
As far as I know, no one has actually informed him of the problem.
I haven't, because I don't use Marvin.
At least one other person is perfectly happy staying on the earlier version of iOS.
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