Windows 7 Pro to Windows 10 Pro In-Place Upgrade

I have 10 workstations that I am upgrading to Windows 10 Professional mainly from Windows 10 Home but I have 1 computer running Windows 7 Professional. I would like to do an "in-place" upgrade on this machine as well as to not lose any programs and applications. I have read numerous articles regarding how to do this. I understand I cannot do this for free. I have and OEM copy of Windows 10 Professional but that would require clean install which I am trying to avoid. Does anybody have a straightforward method to do this? I think I can download and run the Windows 10 Media installation Tool locally on the computer I am wanting to upgrade but I am getting conflicting information about where the licensing fits in. Do I purchase and provide License Key before installation? After installation? Any help in this matter would be greatly appreciated.
fenski4435IT ConsultantAsked:
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JohnBusiness Consultant (Owner)Commented:
In theory, you can upgrade and keep everything.  You may lose some legacy software that is not compliant with Windows 10, and you should also update all drivers and BIOS before starting.

Yes you need to purchase a key in order to complete the upgrade.
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JohnBusiness Consultant (Owner)Commented:
I think you can upgrade to Windows 10, and purchase your key after installation but you need to be sure Internet is working at this point
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fenski4435IT ConsultantAuthor Commented:
The "In theory" scares me a little bit. I am in the process of doing full backup of PC as it has important applications on it. When this is complete, I will attempt the Media Installation tool method of upgrading to Windows 10 Pro. I have also used Dell utility to upgrade BIOS and other drivers as necessary. Thanks for the "heads up" there. I will comment on progress. I am most interested to see where Microsoft is going to ask me to purchase and activate license. Probably after Windows 10>Settings>Activation>Microsoft Store. We'll see.
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JohnBusiness Consultant (Owner)Commented:
Your plan sounds fine. I have upgraded several older Windows 7 machines and (as I noted) some software doesn't come along. Any compliant software will upgrade just fine.

Probably after Windows 10>Settings>Activation>Microsoft Store.


Yes.
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joinaunionCommented:
Hers's  tutorial that may be of help to you.
https://www.tenforums.com/tutorials/2267-upgrade-windows-10-a.html
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fenski4435IT ConsultantAuthor Commented:
Thanks joinaunion. That is useful information that I had not come across. I will hold onto it for future use. Unfortunately, it did not help me fix the issue I was having. I ran the migration tool as described and eventually received and error stating that "License Key could not be validated. I then went and purchased a license prior to running migration tool. After purchase, it provide me a "redeem now" buttom which supposedly inserted the recently purchased product key into to process somehow. Ran the tool again and received the same error "License Key could not be validate. After further investigation I was able to run the setup from an elevated command with the following commands:

cd c:\ESD\Windows
setup.exe /pkey xxxxx-xxxxx-xxxxx-xxxxx-xxxxx

with C:\EHD\Windows being the folder where the migration tool download Windows 10 upgrade files
than
Installation went off without a hitch after this. I then went and used disk cleanup to remove temporary installation files.  Thanks for all of the generous help.
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JohnBusiness Consultant (Owner)Commented:
than Installation went off without a hitch after this.  <-- So the upgrade has worked for you - correct?
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