Old package links in download.sh

I’m trying to setup a development workstation as described at http://www.gpg4win.org/build-installer-gnulinux.html. When I run download.sh (using bash instead of sh as instructed), most of the packages downloaded successfully, but several failed:

line 33: downloading http://zlib.net/zlib-1.2.5.tar.gz failed
line 34: checking zlib-1.2.5.tar.gz failed
line 60: downloading http://www.claws-mail.org/win32/libetpan-0.58.tar.gz failed
line 61: checking libetpan-0.58.tar.gz failed
line 98: downloading http://www.claws-mail.org/win32/bsfilter-1.0.16-bin.tar.gz failed
line 99: checking bsfilter-1.0.16-bin.tar.gz failed
line 101: downloading http://www.claws-mail.org/win32/bsfilter-1.0.16-lib.tar.gz failed
line 102: checking bsfilter-1.0.16-lib.tar.gz failed
line 104: downloading http://www.claws-mail.org/win32/bsfilter-1.0.16-src.tar.gz failed
line 105: checking bsfilter-1.0.16-src.tar.gz failed

I’ve confirmed (copy-and-paste URL to browser address field) that these fail because the packages no longer exist at these URLs.

Can I get these packages elsewhere, or do the build instructions (and download.sh) need to be updated?

Thank you!

…or do the build instructions (and packages.current) need to be updated?

I found zlib-1.2.5.tar.gz and libetpan-0.58.tar.gz on sourceforge. The sha1 checksum for zlib-1.2.5.tar.gz matches, but the checksum for libetpan-0.58.tar.gz doesn’t match.