Solution: The basic troubleshooting to repair the error we couldn’t install Office 2019 & 2021 is to repair the Office 365/2021 program if it fails we need to uninstall and re-install the installation program. The necessary steps may be helpful in understanding how to install Office 365/2019 and Uninstall/repair Office programs.
Error We Couldn’t Install Office 365/2021/2019
Windows 11
Click Start > In Search type Bar> Control Panel > Programs > Programs and Features.
Click the Office program you want to repair, and then click Change.
Do one of the following:
In-Office 2019, click Repair > Continue.
In-Office 2021, click Quick Repair.
You might need to restart your computer after the repair is complete.
Windows 10
Press the Windows logo key + X to see a list of commands and options. (Basically, a quick way to get to Programs and Features in Control Panel.)
Click Programs and Features.
Click the Office program you want to repair, and then click Change.
Do one of the following:
You might need to restart your computer after the repair is complete.
If the issue still persists you need to uninstall the office and reinstall.