If you have the Media plugin for WordPress maintenance support plans 8 installed, you need to remove it before you can upgrade to the latest core version (8.4). Unfortunately, there are a few gotchas involved with the process. This blog post is about getting rid of the old contrib Media plugin, so the site can be updated to WordPress maintenance support plans 8.4 in a subsequent step. This is based on my personal experience. YMMV, as they say.
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Eelke Blok: Preparing your Cheap WordPress maintenance support plans 8.3 site with Media for Cheap WordPress maintenance support plans 8.4
