Use an Appimage manager for Updating appimage progs

You can install and use the Appimage Manager tool for consolidating, updating and upgrading all Appimages:

Add the repository:

sudo add-apt-repository ppa:appimagelauncher-team/stable

Update sources and install:

sudo apt update && sudo apt install appimagelauncher

Once installed, look in the app menu for Appimage Launcher Settings.