Hi David,
Thank you for your question. To have access to download the official courses from Microsoft Learn, you have to be part of MCT Program (Microsoft Certified Trainer, this link shows how https://learn.microsoft.com/en-us/credentials/certifications/mct-certification) or you could join Microsoft Learn for Educators Program (https://fsiwwlprd.powerappsportals.com/en-US/SignIn?returnUrl=%2F)
Best Regards Walter