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Enter the windows 7 COA key on blue sticker on base of laptop or under battery in "Change product key"
Note installed edition of Windows 10 must be correct upgrade path eg if 7 Home SL, you need to install 10 Home SL.
As per ShowKeyPlus application, Window 7 OEM marker present in firmware.
Right click This PC and choose Properties and choose Change Product Key. Enter your product key from showkeyplus and press Next. If it still won't activate, call Microsoft
Today I download Windows 10 ISO using media creation tool. And do a fresh windows 10 installation. When I tried to activate with the COA key, it is giving the error -
Note that previously I did direct upgrade from Win7 to Win10 Home premium using windows media creation tool. Then as per suggestion I use windows key (COA, found in the laptop under battery) to activate. It got activated with Windows 10 Pro. So, today I downloaded Windows 10 using Media Creation tool and install Windows 10 Pro. This time the COA key is not accepted for activation.
Are you positive it's a W7 Pro key ?
I doubt it.
You said you did an upgrade from W7 Home to W10 Home, come on now which is it ?
Yes, I did upgrade to Win10 Home without knowing anything. When activated with COA key in Win10 home, it got activated and it showed Win10 Pro. After activation I run showkey and saved it. Here is showkey info -
The original key showed in showkey is not COA key.Code:ShowKeyPlus - Windows Product Key Information Product Name: Windows 10 Pro Version: 16299.125 (64-bit OS) Product ID: 00330-80000-00000-AA343 Installed Key: VK7JG-NPHTM-C97JM-9MPGT-3V66T Original Key: 27GBM--XXXXX-YYYYY-AAAAA-BBBBB Original Edition: Windows 7 HomePremium OEM:SLP OEM Key: Windows 7 OEM marker present in firmware