Hi,
I'm glad to hear that you're enjoying TubePress for Wix!
if I purchase your product, paying the annual membership, can I use TubePress in more than one of my Wix website accounts?
Good question. As an "App" in the Wix App Market, TubePress is somewhat at the mercy of Wix's billing policies. Based on our understanding of the current situation, you upgrade your apps on a per-site basis. In other words, if you have two Wix sites using TubePress, Wix will bill you twice: once for each instance of TubePress.
I've posted a question in the Wix Developer Forum to get a definitive answer, so I'll post back here once I hear something.
Will I be able to select videos separately for each installation, in other words, do all the videos I upload or link to in TubePress appear on every website I use my TubePress app with or can I select specific videos to feature in each website?
Now this question I can answer definitively. Yes, each of your TubePress installations is entirely independent from the next. You can have as many galleries as you like, either on the same site or scattered across many sites, and each can be configured differently.
Does that answer your question?