You cannot license this asset

You may have a private account (ie: yourself) and accidentally logged on to your school account. Or you may have only a school account where the administrator (the IT person) may have blocked certain possibilities (and that's the norm) such as using Adobe stock assets, sync fonts on Adobe fonts, install 3rd party plug ins from the Adobe marketplace etc...

to check, go to your CC ap, and click on your avatar/logo

and click on "view account"

if that's the case, you need to contact the administrator of your account, and ask them to unlock those features. If you also have a personal account, you just need to switch accounts by looging off, signing in again with your personal credentials and go from there....

I can't download a photo. 

Please apply to https://community.adobe.com/t5/creative-cloud-services/adobe-stock/m-p/11105755?page=1#M1139. I think you will get more replies there.

Usually it happens when you haven't signed with Adobe ID. Try to resign again. May be that can help. 

well you could log it to your private account