Windows 7 to Windows 10 upgrade fails on user profile creation

I'm FINALLY upgrading my Windows 7 Ultimate machine to Windows 10 (several legacy applications that I use for my business have prevented me from upgrading until now). I tried and failed to upgrade my system four times last night. I'm at my wit's end and am hoping that some of you lovely folks can help me.

I performed all of the troubleshooting steps that I could find online. Here is a portion of the log from Microsoft's setupdiag utility ...

Matching Profile found: UserProfileCreationFailureDuringFinalize - C6677BA6-2E53-4A88-B528-336D15ED1A64
SetupDiag version: 1.6.0.0
BiosReleaseDate = 20120517000000.000000+000
BiosVendor = Default System BIOS
BiosVersion = R0142C5
HostOSVersion = 6.1.7601
HostOSEdition = Ultimate
HostOSBuildString = 7601.24545.amd64fre.win7sp1_ldr_escrow.200102-1707
TargetOSBuildString = 10.0.19041.1 (vb_release.191206-1406)

Error: SetupDiag reports user profile creation failure during Finalize.
Last Phase: Finalize 
Last Operation: Gather data, scope: EVERYTHING
Error = 32.
Recommend you check for unused user profiles and remove any unnecessary profiles found.  Reboot and try the update again.

Last Setup Phase:
Phase Name: Finalize
Phase Started: 10/8/2020 11:26:09 PM
Phase Ended: 1/1/0001 12:00:00 AM
Phase Time Delta: 00:00:00
Completed Successfully? False

Last Setup Operation:
Operation Name: Gather data, scope: EVERYTHING
Operation Started: 10/8/2020 11:32:36 PM
Operation Ended: 1/1/0001 12:00:00 AM
Operation Time Delta: 0:00:00:00.0000000
Completed Successfully? False

The Microsoft website says this about the failure ...

UserProfileCreationFailureDuringFinalize – C6677BA6-2E53-4A88-B528-336D15ED1A64
Matches a specific User Profile creation error during the finalize phase of setup. Will output the failure code.

Based upon this information, I deleted all unused user profiles, rebooted, and tried again. Same problem. Thinking that perhaps the Windows 10 installer was unable to update my current profile while I was logged into it, I created a temporary administrator account, logged into the new account, and tried again. Same problem.

By the way, this failure occurred before the first reboot of the upgrade process (I think I saw somewhere that the upgrade includes a total of four reboots).

I went looking for more diagnostic information. Here is another log that I found (I forget where) ...

2020-10-08 22:06:54, Error, MigPlatformStartupOnline caught exception: Win32Exception: User profile loading error. Aborting due to external request.: The specified user does not have a valid profile. [0x000004E5] class Mig::CUserContext *__cdecl Mig::COnlineWinNTPlatform::AddUserContext(class Mig::CRegistryDataStore *,class UnBCL::String *,class UnBCL::String *,class UnBCL::String *,class UnBCL::String *,class UnBCL::String *,class UnBCL::Array<class UnBCL::String *> *,int,struct _FILETIME,int,int,int,class UnBCL::String *,class UnBCL::String *)

And finally, the relevant entry in Event Viewer ...

Fault bucket 307466477, type 528204203
Event Name: WinSetupDiag02
Response: Not available
Cab Id: 0

Problem signature:
P1: X
P2: X (default)
P3: 9 (AMD64)
P4: 1 (failure)
P5: X
P6: X
P7: 7601 (source OS build)
P8: X
P9: 19041 (new OS build)
P10: vb_release (new OS branch)

The only thing I can think to do next is to create an entirely new user profile for myself and move everything from my old profile to my new profile, but I think that will probably lose a whole bunch of my settings. Do you have any other ideas to help me figure this out? Please send them along!