The ticket is reportedly "closed" at this point. Does this seem right/fair? I was entitled to the skin as a WC subscriber.
Yes, it's fair.
You should always back up your software when purchasing or downloading it. Most companies charge extra for extended download access for their software. I was surprised to find that Stardock would supply users with current back ups of their software at the time their Object Desktop subscription expired. I'm not sure if they do that for any of their other software or subscriptions.
If it was me and I wanted it bad enough, I would call their tech support and explain your situation to them. Every time I've called, I've always got someone that was professional and extremely helpful.
Keep in mind, Curt is right, you're no longer a subscriber and you're not entitled to the subscriber skins.
I'm not sure of your situation but it may be easier to just re-subscribe.