If you're encountering the error message "Unable to upgrade your edition. We can't activate Windows on this device as the product key is not valid. (0xc004f050)" on one specific PC while using the same product key successfully on others, here are a few troubleshooting steps you can try:

1. Check the Windows Version: Ensure that the PC is running a compatible version of Windows 11 Home that can be upgraded to Pro. Sometimes, specific builds may have restrictions.
2. Internet Connection: Make sure the device has a stable internet connection during the activation process, as it may need to verify the key with Microsoft servers.
3. Windows Updates: Ensure that Windows is fully updated. Sometimes, pending updates can interfere with activation.
4. Run Activation Troubleshooter: Go to Settings > Update & Security > Activation and select Troubleshoot. This might help resolve any issues with the activation process.
5. Check for Hardware Changes: If there have been significant hardware changes on the PC (like a motherboard replacement), this could affect activation. You may need to contact Microsoft Support for assistance in reactivating.
6. Use a Different Key: If possible, try using another valid product key to see if that resolves the issue.

If none of these steps work, you may need to contact Microsoft Support for further assistance with the activation issue.

You can install Pro without a real key by skipping the key or using a generic install key, but it will not activate. If your laptop had a Pro digital license it may auto activate after install, otherwise you will need to buy a real Pro key from Microsoft