Failed to deploy the virtual appliance

I am trying to install vmProtect on ESXi 5 Update 1 and am getting the following error:
Code: 014712855
Line tag: 0xa20120e2d7d9ec7
Message: Failed to deploy the virtual appliance on the following ESX(i) hosts: 192.168.4.100.

Suberror
Code: 05439609
Line tag: 0x5c3a36ad6832da0
Message: Failed to install the virtual appliance on '192.168.4.100'.

Suberror
Code: 05439609
Line tag: 0x8197895a96804299
Message: Failed to create virtual machine 'AcronisAppliance' (SOAP 1.1 fault: "":ServerFaultCode[no subcode]
"fault.RestrictedVersion.summary"
Detail:
).

I can't find anything on it but could it be something to do with Update 1?