Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
This is by far the easiest way:
1- Buy or borrow a portable hard drive or a USB flash drive.
2- Copy your Excel and Word files from the old computer to the portable hard drive or USB flash drive:
3- Move those files from the portable hard drive or USB flash drive to the new computer.
Doesn't get any simpler, and you are in complete control from beginning to end!