I boot with the SalixLive64 Xfce 15.0 live iso in vmware and there i installed above libreoffice 25.8.3 and openjdk17 packages. Libreoffice is running without errors.

I also installed libreoffice 7.6.2. It is running without errors.
Something is wrong with your system.
Try this. Uninstall all ...

If libreoffice was build with java support then requires openjdk or openjre to run.
Try these packages build for slackware-15.0.
Libreoffice-28.8.3
You will need also openjdk17

Gapan, please add a line in salix-update-manager.desktop otherwise is not shown in System-> Administration on Mate

Merry Xmas

update-grub will update the grub menu.

Installation done without errors using
sudo installpkg dotnet-runtime-8.0-8.0.22-x86_64-1_SBo.txz
While Installation failed using
sudo spkg dotnet-runtime-8.0-8.0.22-x86_64-1_SBo.txz

After using sudo slapt-src -i dotnet-runtime-8.0 the package exists in /usr/src/slapt-src/development/dotnet ...

This cups-check-for-data.patch solves the problem with cups 2.4.15. I recompiled cups and it is working. Just wait for slackware to use it.

--- a/cups/http.c 2025-12-03 16:55:34.714957932 +0100
+++ b/cups/http.c.new 2025-12-03 16:58:31.332742773 +0100
@@ -2779,7 +2779,7 @@
/* See whether our read ...

Slackware in both stable and current roll back to 2.4.14 cups.

Check button for grub is default and is already checked. Cannot check both elilo and grub.
Installer creates an initrd using mmc-core:mmc-block modules for mmc devices since you install in a mmc external disk or usb stick. I suggest to use grub for boot loader.
I suppose your mmc is an exteral disk ...

Firefox from version 145 no longer supports 32-bit Linux operating systems.
Slackel Linux Distribution builds 32-bit firefox package including locales for installing it on x86 slackel and slackware current systems.

Packages for x86_64 and i686 are on Slackel repos.

Build Script and sources ...