Unless the support you need is related to a defect in the product, there isn't a general law that requires a company to provide ongoing support for their product. The marketplace is depended on to sort such issues out (e.g. customers will go to the company that provides the better product and service).
This is, unfortunately, a situation where there is not a legal remedy.
However, if I were in your shoes, one suggestion I would consider would be to look for an individual who does have the experience with the product with whom you might be able to consult with on an as-needed basis. Online forums specific to your industry, even Craigslist, could be places where you might be able to locate or advertise for such an individual.
I hope this helps.
Please let me know, if you have follow-up questions.
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