To get the newest version you need to download the sources from the git repository and compile lemonPOS, there is a wiki guide for this purpose.
Download the latest release from Sourceforge, these releases are in source code form.
When available, we would provide links for binary packages for some linux distributions, for the moment they are old versions. These old version packages links are in the wiki installation guide.
It is strongly recommended that you use the most recent released version, it may contain bug fixes.
If you need documentation please go to the documentation page.