Copy the "ft3xx.o" file from the "nosmp" directory to a floppy. The floppy must be in EXT2 Linux format (limitation of install CD's).
Boot the Slackware Linux Installation CD. Make sure to boot one of the SCSI boot images, like "SCSI.S".
Create the directory "/lib/modules/2.4.29/kernel/drivers/scsi" (you can because it's a ramdisk!). Mount the floppy with "mount /dev/fd0 /floppy". Copy the "fta3xx.o" file to the "scsi" directory. Then load the module with "insmod ft3xx". The device will be "/dev/s