Now I got this. Any hints of what I should do?
pacman -Su
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...
Packages (7) firefox-i18n-en-us-66.0.3-0  firefox-i18n-sv-se-66.0.3-0 firefox-kde-opensuse-66.0.3-1
netrunner-settings-autostart-2019.04-2 netrunner-settings-firefox-2019.04-4 netrunner-settings-sddm-2019.04-1 xdg-desktop-portal-kde-5.15.3-1
Total Installed Size: 182.58 MiB
Net Upgrade Size: 0.42 MiB
:: Proceed with installation? [Y/n]
(7/7) checking keys in keyring [######################################] 100%
(7/7) checking package integrity [######################################] 100%
(7/7) loading package files [######################################] 100%
(7/7) checking for file conflicts [######################################] 100%
error: failed to commit transaction (conflicting files)
netrunner-settings-sddm: /etc/sddm.conf exists in filesystem (owned by sddm-classic)
Errors occurred, no packages were upgraded.