I have bought a lifelong service from Media Feed, some years ago, to download scientific books, but it does not work anymore. Can you help?
There is no information about the exact website regarding the Media Feed you've registered ago. The best way to get information is by using the details and contact emails found in the email you've used to purchase it. The website/company should have identification numbers as well as contact options. use those contact methods to get in touch with them. It's also possible, they've gone out of business.
