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Microsoft 365 and Office | Install, redeem, activate | For home | Windows
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
What do you mean by Microsoft 10.5? Do you macOS? Also Microsoft 365 online version is free. You do not need to upgrade it or pay for it. Simply launch your web browser, go to www.office.com, log into your account. Click on the 9-dot icon on the upper let, choose the apps you want to use from there. You will need to upload your file to one drive to use it.