Server 2.4.9: Error while downloading update signature

After updating the server to 2.4.9 following error appears in the logs:

Error while downloading update signature from http://update.urbackup.org/2.4.x/UrBackupUpdateMac.sig2: HTTP response code said error(ec=22), The requested URL returned error: 404 Not Found

Yeah, forgot to remove this. Will be removed with the next version.