Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Robert,
If you have older version of Office program you need to uninstall it first. Here's the link on how to download the Office free trial version.
Note: Office trial installations are limited period installations, and if you ever had an edition of Office 2010 trial, your system may not allow you to reinstall it again, or install a different trial.
Let us know if you have other concerns.