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 Windows 10 actually can still be activated permanently even if you don't have a product key, but you have to use thirdparty tools or applications There are several tools that you can use to activate Windows 10 offline, including KMS AutoLite and KMS Pico However, to do so you must make some preparations first The steps are given below to remove the activation key from the system Login to the system with an admin account and open cmd with run as admin rights slmgr /upk It stands to uninstall product key The /upk parameter uninstalls the product key of the current Windows Although Microsoft office 19 only works with Windows 10 but if you're using other version of office on older Windows, you'll be able to use it How to activate Microsoft office without product key free? How To Activate Windows 10 Without Product Key Free 21 How to activate office in windows 10 without product key