Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello,
Looks like you might be using a wrong link to download the apps.
Launch your web browser in incognito mode.
Please go to https://account.live.com
Sign into your personal account that was on the subscription.
Then go to Subscription, you should find the subscription you purchased listed. Click on Manage
Then find the Install option to download the installer file. Then open that file to run the installation.