Directly upgrade Win 8.1 to Win 10

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What are the steps to directly upgrade Windows 8.1 to Windows 10 so that all programs, user accounts, and customizations will remain in place after the upgrade to Windows 10 completes?

Is this as easy as downloading the Windows 10 ISO file into Windows 8.1 and then running the Windows 10 setup file within the Windows 8.1 OS and following the prompts to upgrade?
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Distinguished Expert 2018
Commented:
If supported, yes, it is that easy.

You *cannot* "downgrade" editions though...which is why I have to add "if supported."

https://docs.microsoft.com/en-us/windows/deployment/upgrade/windows-10-upgrade-paths

Downgrade scenarios are marked with a "D" on that matrix.
IT GuyNetwork Engineer

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Commented:
Alright, is this upgrade as easy as downloading the Windows 10 ISO file into Windows 8.1 and then running the Windows 10 setup file within the Windows 8.1 OS and following the prompts to upgrade?
Distinguished Expert 2018

Commented:
Same question, same answer.
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JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
Just run Windows 10 upgrade and it will work. Every Windows 8.1 machine I have upgraded to Windows 10 has been long term successful. Drivers and all. Windows 8.1 is the best system to start from to upgrade to Windows 10. As noted, I have done this.
Distinguished Expert 2018
Commented:
"Just run Windows 10 upgrade and it will work."

That isn't 100% true, which is why I posted the matrix.  For example:

If the OP is running windows 8.1 PRo, and runs the setup for windows 10 Home, on the matrix, that is marked with a D.

And according to the doc, and consistent with my experience :  "D = Edition downgrade; personal data is maintained, applications and settings are removed."

The OP asked "What are the steps to directly upgrade Windows 8.1 to Windows 10 so that all programs, user accounts, and customizations will remain in place after the upgrade to Windows 10 completes?"

An edition downgrade would remove apps and settings, which is counter to the "so all programs" that the OP asked for.  Thus...my initial answer.  It depends.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Understand. However I upgraded several Windows 8.1 machines without issue. (Pro to Pro). But I do agree when you say "It depends"
Top Expert 2013

Commented:
>>   so that all programs, user accounts, and customizations will remain in place  <<< i'm sceptic about the "all programs"
many older softwares are rejected by windows 10 during install

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