It appears there was a dust-up with Symantec authorizing subsidiaries to grant certificates, that were then issued outside of acceptable practices. This resulted in some certificates being revoked.
https://www.microsoft.com/security/blog/2018/10/04/microsoft-partners-with-digicert-to-begin-deprecating-symantec-tls-certificates/
Later GeoTrust bought up assets of Symantec regarding certificates, but may be being "tarred with the same brush" as the original.
The certificates on the download are:
Cert details:
Issued to: updates.cdn-aple.com
Issued by: Apple IST CA 2 - G1
Valid from 11/10/2020 to 12/12/2001
based on: GeoTrust Global CA
If you trust any of those certificates manually, you can complete the download and go about your business.