If you encounter Product Key installation error 0x80070005 in Microsoft (Office 365), Office 2019, 2016 or some other version, follow the solutions mentioned here.

Reinstalling software? Older versions of Windows and Microsoft Office require product keys. Here's how to find them before your PC goes kaput.

Support for Office 2016 and 2019 will end soon. After that, Microsoft will no longer provide security updates. This is what users can do.