Abacus is a tool for simple arithmetic calculations.
To know more refer https://github.com/flathub/org.sugarlabs.AbacusActivity
git clone https://github.com/flathub/org.sugarlabs.AbacusActivity.git
cd org.sugarlabs.AbacusActivity
flatpak -y --user install flathub org.gnome.{Platform,Sdk}//46
flatpak -y --user install org.sugarlabs.BaseApp//24.04
flatpak-builder --user --force-clean --install build org.sugarlabs.AbacusActivity.json
Install the flatpak external data checker
flatpak --user install org.flathub.flatpak-external-data-checker
Now to update every single module to the latest stable version use
cd org.sugarlabs.AbacusActivity
flatpak run --filesystem=$PWD org.flathub.flatpak-external-data-checker org.sugarlabs.AbacusActivity.json