Alrighty. . .well, I’m not sure what “worked” but I did the following (thanks for a bunch of “things to try” @TenPatrol !) since all the tries in my above posts
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These Xbox “force stop” fixes including reboots
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Stopped NahimicService and reinstalled my Realtek Audio drivers (I should get a real sound card ) And not sure who recommended this, but I did try it. . . (HT @Hagguen3 in this post)
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Said a prayer
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Ignored it while it ahem downloaded. . .
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Went and played FC6 with MrsCuzDawg
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Was rudely interrupted when the install actually completed.
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Now on to 120GB of content manager downloading.
I’ll actually try and fly tomorrow and report back if everything now works.