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I've never heard of a zip file that self-destructed after a given date. I'm guessing the WTS representative was giving you a deadline in which to download the zip file. If you're having difficulties viewing the zip file, it's possible that it was damaged. You might want to try using a different zip tool, like 7zip, or winzip.
Here's my take on ebooks and retailer's cloud storage. They'll keep your books for you until they can't. The reason why they can't might be that they went out of business; or they had a contract with the author to sell the book, and when it expired, they lost the right to download the books; or their systems got corrupted and they no longer have record of your purchase; or their business model changed and they no longer sell ebooks; or probably another dozen reasons I can't think of at the moment.
So, if you want to make sure you can always access the books you've purchased, make sure you download them and back them up. Ideally, you should strip the DRM because there's no guarantee that the systems supporting the DRM will continue to work in the future (for example, Microsoft's .lit format was discontinued 5 years ago). If you buy a book, and the only way to read it is via some retailer's proprietary application from a cloud server, be aware that you only have that book as long as that retailer is around, and if it's some start-up company, the likelihood of longevity is pretty slim.
I'm not sure how much this message is discussed over in the deals and freebies forum, but if you read the news and general discussions forums at all, this message comes up all the time, at least every time a retailer shuts down. Sometimes they give people a couple day warning, and sometimes there's no warning at all.
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