OS X Server VPP

Hi all,

We purchased two copies of OS X Server through VPP so that we could administer them through Casper and deploy the app to the machines that we wanted (without having to worry about Apple ID's). This worked great initially, both systems were on 10.11.3 and had OS X Server 5.0.15 deployed to them. I then upgraded both systems to 10.11.5 and then found out that Server wouldn't run on either of them until it was updated. That was a bit shortsighted of me to not check that first but it's done now. The problem is that even though Casper sees the updated app in the App Store if I try to upgrade either of them they fail with the message "OS X Server failed to download. Use the Purchases page to try again".

I have tried removing the Server.app on one and installing again but it fails with the same message.

I do have a call open with Casper but to be honest I'm not sure whether this is a Casper or App Store issue. Has anyone else had a similar problem? Right now I have two dead servers, luckily they weren't live but I need this sorted asap. Short of saying goodbye to using VPP and creating a new apple ID and buying Server again I am a bit stuck.

Many thanks for any advice!