I'm attaching my slackpkgplus.conf to find out the deference.im on current but you will get the point
Configuration for slackpkg+.
# Please read manpage: "man slackpkgplus.conf" and documentation /usr/doc/slackpkg+-*/README
# Enable (on) / Disable (off) slackpkg+
SLACKPKGPLUS=on
# set to '0' to never show the download progress bar
# set to '1' to show the bar only in download packages (default)
# set to '2' to always show the download bar
# set to '3' for a debug mode
VERBOSE=1
# Enable TERSE to use a smaller output in installpkg/upgradepkg
USETERSE=on
# Enable a smaller output for slackpkg search. It replace first column with one colorized
# on: [unin] uninstalled, [inst] installed, [upgr] upgrade, [mask] uninstalled/masked
# tiny: [-] uninstalled, [I] installed, [I] upgrade, [M] uninstalled/masked
# off: leave unchanged and black/white.
#TERSESEARCH=tiny
TERSESEARCH=on
# Use proxy. Leave commented to use system settings.
#PROXY=off
#PROXY=<host>:<port>
# By default slackpkg+ deny to install 32bit packages.
#
# Set this flag to 'on' allow slackpkg+ to install 32bit packages on a 64bit slackware
# installation (possibly unsafe). Please, do not install both 32 and 64bit of the same
# package to avoid problems, and NEVER upgrade existing 64bit packages with relative 32bit package.
# Do not forget to install the multilibs.
ALLOW32BIT=off
# Enable (on) / Disable (off) the official slackpkg blacklist. May be useful to temporarily skip
# the slackware blacklist. You can also override it from command line:
# 'USEBL=off slackpkg upgrade-all'
USEBL=on
# Enable (on) / Disable (off) the legacy blacklist system ignoring the improvement
# from slackpkg 15. Some improvement are not useful with third party repositories
# Note that the legacy system does apply it as regex to the entire pkglist row
# repository, name, version, arch, build, fullname, series/path, extension.
LEGACYBL=off
# Add custom option to 'wget'.
# You can solve the repository unavailability problems by set a timeout here
# Also add "-q" for super terse output (useful with USETERSE=on)
WGETOPTS="--timeout=20 --tries=2"
# If you want replace wget with another downloader search DOWNLOADCMD in documentation
# at /usr/doc/slackpkg+-*/README
#DOWNLOADCMD="wget2 --progress=bar -O"
# Enable (on) / Disable (off) checking disk space to download and install packages. Default to "off"
#CHECKDISKSPACE=on
# Defines if the changelog of any third party repository must be searched in parent URL when not found in base URL.
# Can be set to "on" or "off" (default)
SEARCH_CLOG_INPARENT=on
# Use the cache for metadata files (CHECKSUMS.md5,...). Enable it (on) to speedup the slackpkg update
# process by downloading just new files (see README). Disabled by default (off)
CACHEUPDATE=on
# You can download-only by setting DOWNLOADONLY to 'on'. You may (you should) also use it in command line,
# for example: "DOWNLOADONLY=on slackpkg upgrade-all". Useful for large upgrades.
# You may also use 'slackpkg download' if you want to download few packages
#DOWNLOADONLY=off
# Enable (on) / Disable (off) notification events (see notifymsg.conf)
#ENABLENOTIFY=off
# Enable (on) / Disable (off) the greylist feature. See /etc/slackpkg/greylist
GREYLIST=on
# Defines if commands 'search' and 'file-search' are case-sensitive (on) or not (off). Default to "on"
SENSITIVE_SEARCH=off
# Defines if command 'file-search' does search Whole Word (on) or accept partial words (off). Note that
# you may obtains many many results searching a short partial word
WW_FILE_SEARCH=off
# Select the show order in dialog box. Available "package" "repository" "tag" "path" "arch"
SHOWORDER=package
# Allow to show more details of the package in 'slackpkg info <package>'. Accepts "none", "basic", "filelist"
DETAILED_INFO=basic
# Enable (on) / Disable (off) a Strict GPG Check. A repository should contains packages signed
# with the only original GPG-KEY. In some custom repository may be wanted to mix heterogeneous
# packages; to use that repository set Strict GPG Check to off. P.S: a repository can
# contain just ONE gpg-key; you may manually import the other.
STRICTGPG=on
# If two or more repositories contains some same packages, you can specify
# from which repository you prefer to search it.
# The syntax is "<repository_name>:<package_name>"
# Accepts regular expressions. To give priority to an entire repository use "<repository_name>"
# Examples:
#PKGS_PRIORITY=( restricted:vlc )
# OR
#PKGS_PRIORITY=( myrepo )
#
# if you have two repositories to give priority you must set both in the same line
#PKGS_PRIORITY=( myrepo restricted:vlc )
#
#
# If you want a multilib system, uncomment the 'multilib' repository and set:
#PKGS_PRIORITY=( multilib )
#
# (Use /usr/doc/slackpkg+-*/setupmultilib.sh to setup a multilib configuration)
# Otherwise you can try to upgrade a package from a repository that contains a package with the
# same tag of the already installed package. Typically that means to upgrade a package from the
# same author of the already installed package.
# Note that this method may not works properly where two repositories contains a package with the
# same tag.
# Set TAG_PRIORITY to 'on' to enable this function
TAG_PRIORITY=off
# List repositories you want to use (defined below)
# remember to launch 'slackpkg update' if you modify this row.
#REPOPLUS=( slackpkgplus restricted alienbob )
REPOPLUS=( slackpkgplus alienbob restricted )
# Define mirrors (uncomment one or more mirror; remember to add it to REPOPLUS)
# GPG Note: after adding/renaming a repository, you must to run 'slackpkg update gpg';
# some repositories as salixos, have a partial GPG support;
# for that repositories you may need to run slackpkg with 'slackpkg -checkgpg=off ...'
# Slackware 15.0 - x86_64
#MIRRORPLUS['multilib']=https://slackware.nl/people/alien/multilib/15.0/
#MIRRORPLUS['alienbob']=https://slackware.nl/people/alien/sbrepos/15.0/x86_64
#MIRRORPLUS['restricted']=https://slackware.nl/people/alien/restricted_sbrepos/15.0/x86_64
# use this to keep the slackpkg+ package updated to the latest stable release
MIRRORPLUS['slackpkgplus']=https://slakfinder.org/slackpkg+15/
#MIRRORPLUS['alienbob']=https://slackware.nl/people/alien/sbrepos/current/x86_64/
MIRRORPLUS['alienbob']=https://slackware.nl/people/alien/sbrepos/current/x86_64/
MIRRORPLUS['restricted']=https://slackware.nl/people/alien/restricted_sbrepos/current/x86_64/
#
# use the development branch to use the mainline version and help develop by reporting bugs.
#MIRRORPLUS['slackpkgplus']=https://slakfinder.org/slackpkg+dev/
# Local repository:
#MIRRORPLUS['alienbob']=file://repositories/alien/sbrepos/15.0/x86/
#
# Local packages (you do not need metadata nor 'slackpkg update' command):
#MIRRORPLUS['myrepo']=dir://repositories/mypackages/
#
# Remote packages (you do not need metadata)
#MIRRORPLUS['slackpkgbeta']=httpsdir://slackpkg.org/beta/
# SBo SlackBuilds. Uncomment it to allow slackpkg to search SlackBuilds on SlackBuilds.org
# This does not replace sbopkg; slackpkg just report the package, version and url; you may
# download it via 'slackpkg download <packagename>' and build it yourself or via sbopkg.
#SBO['15.0']=https://www.slackbuilds.org/slackbuilds/15.0/
#SBO['current']=https://cgit.ponce.cc/slackbuilds/
# Plugin section:
# Here you can enable some optional feature. Please read documentation before enable it.
#
# ZLookKernel can help you to rebuild initrd and reinstall lilo/elilo/grub. This feature was
# removed in slackpkg-15.0. 'enable' this setting to enable it.
# read /usr/libexec/slackpkg/functions.d/zlookkernel.sh for more information
# It will ask confirmations at every step, unless you will set 'PLUGIN_ZLOOKKERNEL_PROMPT=off'
# It will manage /boot/vmlinuz by default; if you use kernel generic, please set
# the PLUGIN_ZLOOKKERNEL_IMAGE=/boot/vmlinuz-generic to manage it
#PLUGIN_ZLOOKKERNEL=disable
#PLUGIN_ZLOOKKERNEL_PROMPT=on
#PLUGIN_ZLOOKKERNEL_IMAGE=/boot/vmlinuz
#
# ZChangeLog track all repository changes everytime you run 'slackpkg update'
# It write the changelog at /var/lib/slackpkg/RepoChangeLog.txt
# 'enable' this setting to enable it. Also set 'PLUGIN_ZCHANGELOGS_SHOW=on' to print
# the changes in standard output at the end of 'update' process.
# read /usr/libexec/slackpkg/functions.d/zchangelog.sh for more information
#PLUGIN_ZCHANGELOG=disable
#PLUGIN_ZCHANGELOG_SHOW=off
#
#
# Supported Repositories (see /usr/doc/slackpkg+-* for details and notes):
#
#slackpkgplus: https://slakfinder.org/slackpkg+{dev,1.7,1.8,15}/
#multilib: https://slackware.nl/people/alien/multilib/{15.0,current}/
#
#alienbob: https://slackware.nl/people/alien/sbrepos/{15.0,current}/{x86,x86_64}/
#restricted: https://slackware.nl/people/alien/restricted_sbrepos/{15.0,current}/{x86,x86_64}/
#msb: https://slackware.uk/msb/{15.0,current}/latest/{x86,x86_64}/
#csb: https://slackware.uk/csb/{15.0,current}/{x86,x86_64}/
#slackers:
https://slack.conraid.net/repository...are64-current/
#slackonly:
https://packages.slackonly.com/pub/p...s/15.0-x86_64/
#slackel: http://www.slackel.gr/repo/{i486,x86_64}/current/
#slint:
https://slackware.uk/slint/x86_64/slint-15.0/
#salixos: https://download.salixos.org/{i486,x86_64}/15.0/
#salixextra: https://download.salixos.org/{i486,x86_64}/extra-15.0/
Slackware 15 x86_64 - Slackpkg+ won't fetch from 3rd party repositories
