Can't download atlases

when I go here: Interactive Atlas Viewer :: Atlas Viewer with google chrome, I get this message:

Revoked or Expired Certificate Website Blocked by DHHS/NIH

Certificate Name: *
Category: any
Issuer: Sectigo RSA Domain Validation Secure Server CA
Status: expired

Is there something you can do about this, or is this something my institution (NIH intramural) has to address?

This looks like your institute is blocking the domain. If this has worked before then perhaps they have made some recent changes that accidentally blocked it. The site works fine for me on multiple browsers. Contact your IT administrator and they should be able to resolve it.