Your log is very short so not much is being done.
Regarding the Win 8.x PBR image, I see from the reagentc command, that image is showing as being in the C:\ProgramData\Microsoft folder.. It would normally be in one of the large Recovery partitions.. I have to wonder if the upgrade,
this one or a prior one, set that up. Is this causing problems for the upgrade, I don't know..
In some circumstances, the install can fail but not give signs that it has. Some errors might be related to the system trying to recover..
If you know of problems with you internet connection, can those be taken care of? Seeing errors like the ones below may be involved..
Error CONX Windows::Compat::Appraiser::Utilities::SendRequest (1374): Failed to connect to the internet or send request: [12007].[gle=0x80072ee7]
Error CONX Windows::Compat::Appraiser::Utilities::DownloadCabFile (4355): Failed to send request using default proxy[gle=0x80072ee7]
Error CONX Windows::Compat::Appraiser::Utilities::SendRequest (1374): Failed to connect to the internet or send request: [12007].[gle=0x80072ee7]
Error CONX Windows::Compat::Appraiser::Utilities::DownloadCabFile (4366): Failed to send request using auto proxy[gle=0x80072ee7]
Error CONX Windows::Compat::Appraiser::Utilities::DownloadAndExtractCab (4157): Failed to download cab file: [0x80072ee7].[gle=0x80072ee7]
ERROR_INTERNET_NAME_NOT_RESOLVED
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12007 <<< -- 2ee7
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The server name could not be resolved.