Hi José Luis
Indeed, this feature would be great. In fact I've been having the intention to include it since some versions, but other pending tasks have always stolen me the time required to implement it. This is a critical task that must be implemented very carefully.
Thanks for pushing me in this direction. My idea is to write a system that automatically allows you to download and install a single module, or an updated core application, or any set of components, not necessarily a complete version. This would be wonderful because it would save me from publishing a whole new version when a severe bug is detected. From the user side, it would be also great because each bug fix would be applied immediately.