Okay i read on the Web all i need to do to upgrade to my Enterprise Edition was to log on to VS Community Edition (7.2 Preview) with my MSDN enterprise license.
Hey Xamarin: My Community Edition (Preview 7.2) does not require a login. 
What are they talking about?
I have MSDN Enterprise license. Is that the correct license?
I tried the link for download:https://www.visualstudio.com/thank-you-downloading-visual-studio-mac/?sku=enterprisemac&rel=15 used the link for Enterprise edition at lower right. opened the dmg Disk image. It told me I was all up to date and did nothing. Please help me get the best verion as I have paid for it.
Kind Regards, and Thanks in advance
Mark