Visual Studio 2015 Enterprise : Download license is insuficient

We've encountered in the recent past days a problem with  activating and renewing Visual Studio 2015 Enterprise licenses .

Here is a nice post describing what is the problem :
https://social.msdn.microsoft.com/Forums/en-US/299d609b-419e-4f88-9a03-24cf79436a76/download-license-is-insufficient?forum=TFService