Problem upgrading from Win8.1 to Win10 [SOLVED]

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Trying to upgrade my Win8.1VM to Win10. I had successfully registered for the update but this fails during the installation.


I have got around this by using the direct update tool


This allows me to download and start an in place upgrade.



All appears well until it reboots during the installation. A blue screen flashes up exception error handling thread error. The VM then reboots and falls back to the Win8.1 VM where a Windows setup message states that Windows 10 could not install.



0xC1900101 - 0x20017

The installation failed in the SAFE_OS phase with an error during boot operation


Is there something specific to operating Win8.1 as a VM that needs to be done to ensure that the upgrade to Win10 is successful?


My understanding is that there is currently no way to convert a Win8.1 product key to a Win10 product key so that the upgrade is the only viable option (vs clean install).



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In another thread people were receiving upgrade errors for Windows 10 build updates that seemed to be solved by only assigning a single core (I believe most just used the default "0" core) to the VM.

I'm perplexed as to why it helped with updating in that situation, but it's worth attempting.

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I can also confirm that the upgrade of a Windows 7 VM to Windows 10 works fine when only enabling one CPU core (core 0). Just wish I would have read this before trying many times before without success and strange / meaningless error messages - well done Microsoft.  >:(


It's more likely the implementation of KVM/QEMU to blame for this, but testing on Microsoft's side would have been nice!

Remember it's now Windows as a service, so they'll fix these things later....  ;) Also you won't know it because you can't say no!

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  • 5 weeks later...

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