Slackware ARM on a Raspberry Pi
Slackware ARM 14.2 installer image and system packages
SARPi downloads won't be available for Slackware ARM 14.2 [soft float port] on the Raspberry Pi 4.
NB: The SARPi Project has no plans to build Slackware ARM 14.2 installers or packages for the Raspberry Pi 4.
Support for Slackware ARM
If you're in need of help, or have something to contribute, one of the best places to get (and offer) support for Slackware ARM is on the Linux Questions Forum. Another priceless resource is the Slackware Documentation Project.