Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The installer you list is an Apple Mac installer for the Office Business Pro version of Office, are you trying to install Microsoft 365 on a Windows laptop or an Apple laptop?
When you activated Microsoft 365 (Office) that licence should have become associated to your Microsoft Account as a digital licence online and it is from there that you can download and install Office without the need for a product key: