Here’s LibreOffice 7.4.3.
My Slackware packages (targeting the 15.0 and -current releases) are available from, my own or any mirror (wait a bit to get the packages synced over there).

Friendly reminder: These packages depend on openjdk11. On -current, please also install boost-compat and icu4c-compat to get back the older libraries that are part of Slackware 15.0 but not found in -current.
Go fetch!