This is to answer the question I came here for, how to block the irritating Zombie update messages. I created two Outgoing rules in Windows Defender Firewall to block two of the Xara/Magix apps from calling home. Once blocked, the two message popups no longer appear, and without it appearing to affect my normal usage of XPGD-17 in any way. You will need to go into Defender's Advanced mode to create a new Outbound rule, and for each you will have browse for the relevant application, both are identified in the screenshot. Once the rules are enabled, the irritations will no longer pop up.
edited Outgoing to Outbound.
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