@goldenducky Sorry to hear that you're having trouble!
I have some questions to ask that will help us troubleshoot what's going on.
I don't want to assume just because you're a premium member, but are you buying the premium ebooks from our site, or on another store such as Kindle or Kobo?
Are you on PC or phone?
What kind of program or app are you trying to use? Is it the latest version?
Have you tried using a different program/app?
What warnings or errors are you seeing? If none, what exactly is happening when you try to open an ebook?
Which series/volumes exactly are you having trouble with?
If some books do work correctly, which volumes are those?
If you don't feel comfortable answering these questions on a public forum, you can also send an e-mail to support@j-novel.club.