Hi Richard,
I totally understand your concern. and we're very sorry for any inconvenience that may caused.
This is a good and valid question; however, it truly has nothing to do with System Center Essentials.
If your case is quite urgent, we recommend you open a case in Microsoft CSS support.
Support options for business users
https://support.microsoft.com/en-us/gp/contactus81?forceorigin=esmc&Audience=Commercial
Thanks for your understanding.
Here are some information about Microsoft Assure Plan for your reference.
https://www.microsoft.com/en-us/download/details.aspx?id=53596
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