Error message when opening the downloaded .acsm file

Hello,

     I have tried with the latest version of Adobe digital editions and also in 3 different computers to access online content from a e-library website. After download the .acsm file Your software always shows the same error message on all the computers. I want to tell you that I am using the latest up to date windows 10 software as well as latest updated version of adobe digital editions.

     Error message is : w_adept_core_expired. Error getting License. License server communication problem.

     I am very frustrated. I content the other party from whom I want to acquire the e-library contents. They said its all OK from there end.

     Help me to solve the problem and access the content. I have also uninstalled and reinstalled, erased authorization and reauthorized in both ways using computer as well as adobe id.  Help help...

Thank you