It has to be pretty old or weird to not be cached. And if it isn't cached, you can paste a magnet link and the site will pull it down to your cloud storage so you can stream it either off the site or through your preferred client. But I can count on the thumbs of one hand how often I need to do that in a year.
DM cody_premiumize on Reddit for a trial code: https://www.reddit.com/r/Addons4Kodi/comments/1tbltsm/premiumize_trial_codes/