From @brucellino on Fri Jun 03 2016 09:17:39 GMT-0400 (EDT)
when the files downloaded are not found, we get a 404 and the script getting the files dies. the other scripts waiting for the tarball to appear don't get notified and we have to remove the lockfile manually. this needs to be taken care of cleanly by the script.
Copied from original issue: https://github.com/AAROC/CODE-RADE/issues/83