Amule is currently not available for installation from the AppCenter, as there’s no flatpak version available. The easiest option to run Amule is to use Podman to run a instance of Ubuntu within EOS and run Amule there.
Hi, @Alvaro_Munoz!
Right now is only possible to install apps that are based on Flatpak. We kindly suggest contacting your software developers’ in order to suggest them to create a version compatible with it.
These articles will provide more details about it: