LibreOffice 26.2.3 packages for x86_64 and i586 is on Slackel repos along with x86_64 and i586 lang and help packages.
You also need to install apache-ant and libnumbertext and liblangtag from slackel repos.
Install openjre which is a dependency and is small in size 26MB for java support.
Slackel users do not have to do anything, system will inform for update.
These packages work on slackel and slackware current only.