upgrade path from windows 7 enterprise to windows 10 pro

I have several computers with Windows 7 Enterprise. And I have Windows 8 Pro retail copies.
I"m trying to upgrade the computers to Windows 10.

What are upgrading options I can take other than?;
Install clean Windows 8 Pro-> Upgrade to Windows 8.1Pro -> Upgrade to Windows 10 Pro

This is too much for me. Is there any suggestion to do this faster than this two upgrades and restoring user files?
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You cannot "downgrade" Enterprise to Pro.  Your only option is to wipe and reload with 8 and then upgrade OR to purchase the volume licenses for 10.  You could build an image, but properly building an image so you don't potentially have problems down the road will take 16-40 hours in my opinion... and that assumes you have a clear goal in mind and experience using the deployment tools.
You can downgrade. same for 7.
Afterwards, you can upgrade to 8, activate and upgrade to 10.

That would mean to do 2 inplace upgrades, quite a ride.

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Lee W, MVPTechnology and Business Process AdvisorCommented:
I'm concerned McKnife's suggestion could be a violation either of the license agreement or considered a "hack"
The action I linked looks perfectly legal to me. I'd like to hear what makes you think differently.
See, the registry changes the edition but it doesn't leave you with added value. In fact, you'll have an unactivated pro version afterwards, being just as legal as any other clean install of pro, that is not yet activated.

Please explain.
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