When you try to upgrade your computer to Windows 10, you receive Windows Activation error 0xC004F074; then the cause could be due to support version mismatch between the KMS client and the KMS host machine.

0xC004F074 – The Key Management Server (KMS) is unavailable

This error also can occur when there may be a time difference between the KMS client and KMS host machine.

Here are a few fixes and suggestions:

1] Install the KMS Product Key

2] Use Activation Troubleshooter

3] Resync Time

Timecodes:
0:00 Intro
0:31 Ensure windows is up to date
0:49 install KMS product key
2:08 Phone Activation
3:08 Activation Troubleshooter

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