I cannot update my apps

[Aragorn]

Try updating your mirror list and your system.

sudo pacman-mirrors -f && sudo pacman -Syyu && pamac update --force-refresh

Let it finish and do not interrupt the upgrade process.

[HowTo] Updating Manjaro as safely as possible

The golden rule — which nobody follows, of course — when using a rolling-release distribution…: Always apply the bundled updates by way of the command line in a tty while completely logged out of your graphical environment, so that no shared libraries will be in use that will be overwritten by the update process. The safest way even would be to cleanly reboot your system first before applying any updates, and to then switch to a tty and run the update process from there without logging into…