1. Press the “Windows key” + “R”, type “slui.exe” and hit “Enter.”
2. Enter your Windows 10 Pro product key. If you don’t have a product key, you can purchase it from our store. (If error code “0x800f0805” appears after applying the product key, please make sure that you have at least 20 GB of free disc space and that Windows is updated to its latest version. If two points apply to you, it is evident that some important system files are missing. In that case, it is necessary to perform a clean installation (see Option 1).
3. Go to “System” – “About” and “Change product key” (Click “Yes”, if User Account Control comes up)
4. Enter your Windows 10 Pro product key and make sure all open applications are closed and your work is saved, then start the upgrade.
Be patient as the upgrade process begins because your computer will restart multiple times. Depending on the system, the upgrade process can take a while. However, based on our experience, it only takes five to ten minutes.
If you want to learn about how to install Windows 11 Pro or need to know about the Office 2021 Pro Plus installation process, check our blog.
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