Obtaining ZipSlack or BigSlack is easy. If you have purchased the official Slackware Linux CD set, then you already have ZipSlack and BigSlack. Just find the CD that contains the one you want and place it in your CD-ROM drive. It's usually the third or fourth disc, but always trust the labels over this documentation.
If you want to download ZipSlack or BigSlack, you should first visit our “Get Slack” web page for the latest download information:
http://www.slackware.com/getslack/
ZipSlack and BigSlack are part of each Slackware release. Locate the release you want, and go to that directory on the FTP site. The latest release directory can be found at this location:
ftp://ftp.slackware.com/pub/slackware/slackware/
You'll find ZipSlack in the /zipslack subdirectory and BigSlack in the /bigslack directory. ZipSlack is offered as one big .ZIP file or floppy-sized chunks. The chunks are in the /zipslack/split directory. BigSlack is only offered in chunk form.
Don't stop at just the .ZIP files. You should also download the documentation files and any boot images that appear in the directory.