I have 4 eventide plugins that I bought from a friend who was the original owner. It is registered under my account now though. Will I able to upgrade to anthology X for $199? Or plugins have to be bought directly from eventide to be eligible for upgrade?
It doesn't matter whether you were the original owner of the plugins or not, or whether the plugins are registered to you or not; the only thing that matters is whether the licenses are in your iLok account. If they are, the licenses are eligible.