Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello James Cheyne,
Thank you for reaching out to Microsoft Q&A forum
Can you describe more detail on what happen when you tried to download your copy of MS365? What of Microsoft do you use? Personal or Business?
In meantime, make sure you follow the correct step of download and installation of MS365:
Download, install, or reinstall Microsoft 365 or Office 2024 on a PC or Mac
Feel free reply back to this post if you need further assistance, I'll be happy help.