Upgrade Windows 10 to 11 Manually

One of my PCs wasn't prompted for Windows 11 upgrade, but upgrade check passed.

Download

Windows 11 Installation Assistant can be downloaded from https://www.microsoft.com/en-au/software-download/windows11.

Install

To trigger manual upgrade, need to download Installation Assistant.

Troubleshooting

Got error when first time ran Installation Assistant. Error code #800070079. Then reboot to fix the issue.

References

How to upgrade a compatible PC to Windows 11 from Windows 10