Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Sylvia
If there is a free trial of Office 365 on that new PC, your should completely remove that before trying to install Office Home and Student 2019
Use this tool from Microsoft to remove all remnants of any previous Office Installation:
https://support.office.com/en-us/article/Uninst...
Restart your PC
Did you get a Product Key for your purchase of Office Home and Student?
If so, use this link to install Office Home and Student: