Sorry for the late reply, in the gallery you can run an advanced search and filter the apps based on SDK, position or platform. For example here is a search that is filtered for V2 desktop apps.
Our Leap Motion hardware has remained virtually unchanged since it was designed. The magic lies in the software and this is where we have been making developments and enhancements to provide accurate and robust hand tracking.
You can check your firmware version by accessing the Leap Motion Control Panel on your computer and then click on the about tab. The latest version is 1.7.0.
To ensure that you are running the correct software version for your needs I would recommend having a look at this link and following the onscreen instructions.