rproffitt: There are prior discussions about this. Example where they went with an in-place upgrade:
https://www.tenforums.com/performance-maintenance/23170-sfc-corrupt-files-2.html
Which is a great idea except I was stuck in the Recovery Console. I ended up copying some known good files from the WinSXS folder to clear up the CSI Payload Corrupt errors. Couldn't figure out the manifest errors.
For some reason the Windows Boot Manager wouldn't boot from a USB so I tried enabling it from BIOS. Hilariously, the USB didn't boot but Windows finally did.
I'm still wrestling with it. Now I'm trying to get the Creators Update, but it keeps failing. DISM and SFC both report success. The Update Troubleshooter reported success then failure. Now I'm going for an in-place upgrade.