Airgaptool download Error

We are trying to download a fixlet image airgaptool.
Some files fail.
The following error log is generated.

ERROR: * FAILED 1: Error detected during download. Error = Exception: HTTP Error 60: SSL peer certificate orSSH remote key was not OK: SSL certificate problem: self signed certificate in chain

Only a few files fail.

Is there a problem with the certificate??

Please see Important note on LicenseUpdater or Airgap Errors due to certificate