Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
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HUP purchases for perpetual licenses only remain valid if the following conditions still exist
#1 - You are still employed by the organization applicable to the HUP purchase
#2 - The organization is still enrolled in the HUP program
#3 - You still have access to the email address from that organization used to complete the purchase.
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- If I can not obtain a product key code, can I purchase it from Microsoft website?
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Office '2016 can no longer be purchased from Microsoft. It went out of support on Oct/ 13, 2020. There are some 3rd party resellers claiming to sell licenses to old versions but would proceed with caution especially if the price is "too good to be true". The product key for those licenses may activate Office initially but you may find yourself rudely awakened to find that Office is suddenly deactivated and the key worthless. Your only recourse in that situation is with the vendor from whom you made the purchase.
What you can get that will work on Win 8.1 is an Microsoft 365 Personal subscription. System requirements for various Office versions are described in
Microsoft 365 and Office Resources
https://www.microsoft.com/en-us/microsoft-365/m...
Information regarding Microsoft 365 subscriptions
Microsoft 365 Comparison