Dell Optiplex Windows Reinstall Version Question

The hard drive went out on this pc and im having to reinstall everything. The pc had a windows 8.1 license but was upgraded to Windows 10. To reinstall do I have to install 8.1 or will take a Windows 10 install and activate with a Dell Windows 10 Disk?
cnl83Asked:
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dbruntonCommented:
Just install Windows 10.  No license or serial required.

Windows 10 will recognize it has been previously installed on this machine and activate.
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8046586Commented:
If you have Windows 8.1 activation key, you can still activate Windows 10 with it (if needed).
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cnl83Author Commented:
Dell computers come with it built in.
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JohnBusiness Consultant (Owner)Commented:
No need to install Windows 8 as noted by dbrunton. I have reinstalled Windows 10 on a Windows 8 machine that had been upgraded to 10 and it went fine.

Make a Windows 10 ISO from the Media Creation Link and use that to install. Make it for a different PC.

https://www.microsoft.com/en-us/software-download/windows10
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8046586Commented:
At home, I have Optiplex 990. After HDD upgrade with SSD and installing Windows 10, I activated the OS with Win 7 key that comes with the PC.
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Jason CarsonFreelance Computer TechnicianCommented:
Once a machine has had Windows 10 installed and activated on it you can then reinstall windows 10 as many times as you want without a product key and it will activate on its own.
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MacleanSystem EngineerCommented:
For Dell always make sure you use the Dell Media, not the OEM Windows one as it might not pickup the key build into the Dell BIOS

http://www.dell.com/support/home/nz/en/nzdhs1/drivers/osiso/recoverytool
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