I had a TechNet Subscription prior to it’s ending that I used the keys for Windows 7 and 8 on several of my PCs to install an operating system. Recently I replaced a Hard Drive, installed Windows 7 Pro and used one of the keys to activate windows 7 and was successful. The notification appeared saying I am eligible for Windows 10 Upgrade and I took advantage of it. However, Windows 10 did not activate and I am getting the error “Activate failed because this device doesn’t have a valid digital entitlement or product key. Get Help or you can use web browser to contact support using the virtual assistant. Then at the Installation ID screen, you will be prompted to call the number listed on the screen.Proceed with on-screen instructions. Select your country or region and click Next. This action will launch the activation wizard. Press Windows key + R then type: slui hit the Enter key. To use the troubleshooter, select Start > Settings > Update & Security > Activation, and then select Troubleshoot. If you’re unable to activate Windows 10, the Activation troubleshooter could help.

But how come it doesn’t recognize my key!? What should I do? I upgraded during the free event, so I am a legal user. The problem is, It doesn’t recognize my win 7 English version key. Now the windows crashes, so I reinstall a win 10 downloaded from Microsoft media creation tool. I went to Acer service center to buy another OEM win 7 English version, and Acer installed it. I bought a Acer laptop from Taiwan a long time ago.

Windows media center product key