Hello,
The thing is that recently Microsoft has upgraded the 64-bit version of the Azure AD Module. The new version of the module targets the .NET Framework 4.0 runtime, however Adaxes targets .NET Framework 2.0 runtime, which makes it impossible to load the new version of the Azure AD Module in Adaxes. We are planning to switch Adaxes to a higher .NET Framework runtime version in Adaxes 2015.1, but this can't be done that easily and requires a lot of work. Unfortunately, the licensing model of the Azure AD PowerShell Module doesn't allow us to re-distribute the old version of the module that worked well with Adaxes. Also, Microsoft has removed the old version from their web site.
We are currently trying to get Microsoft to upload the old version of the module to their web site or provide us an alternative solution. If you need to implement Office 365 management with Adaxes urgently, the only thing we can suggest is install the 32-bit version of Adaxes and the 32-bit version of the module (which hasn't been updated yet) until we somehow resolve this issue.