I'm using Moodle version 3.5.2 and the only version that worked was Offline Quiz 3.4.2.
I passed some information to the developer, but after a while he stopped interacting with me. I imagine he has no time available to check these errors in an older version of the plugin. But in our conversation he mentioned that some functions had changed in the latest versions of the plugin.
So I find it easier to update my Moodle and use the latest version of the plugin.
I am making this update on 12/18/2019.
General plugins
Activity Offline Quiz
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