not sure if it'll help, but here is my two cents...
Two links that may prove helpful:
Slackware Torrents
README.1st
Quote from README.1st:
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If you're reading this on ftp.slackware.com, you will find that the
ISO images are not here. This is because we simply don't have the
bandwidth at ftp.slackware.com to provide ISO images.
ISO downloads take a long time, and block people from retrieving
small updates.
If you're looking to download the ISO, consider using BitTorrent.
If there are active torrents available, information may be found on
on
http://slackware.com. BitTorrent is available as a package for
Slackware in the /extra directory.
Mirror sites may also have the ISO images up for FTP.
Use the .asc files here to verify your ISO images are authentic.
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Also If you're new to torrents, checkout:
Bittorrent.com
-Jon