Just ignore the message and let it install. If a hacker gets so desperate that they're hiding malware inside Astronomy software I'm not sure what the world has come to...
Anyway, I don't believe it is the cause of your AP1600 issues Greg. As per the Groups.io forum, "There is a problem with the latest ASCOM Platform - v. 6.5 that prevents correct plate solutions in APPM".
DT
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