You usually have to consult with a specialist on this topic, as it is a tricky thing to do when you don't know what you are doing. I don't think the specialist will charge anything for this kind of work, so you will not have to spend money to find out what version of windows installer is running. If you want to do that by yourself and ensure that everything is working correctly, you must save your data and delete your windows. You can get the latest version from https://mysoftwarekeys.com/product/windows-10-pro-mak-500-pc-activations-license-key so that your installer will run the newest version of windows.
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