Please check the FAQ before installing Altitude
This is a BETA release. We highly recommend that you consult the software’s FAQ on the Forum BEFORE installing the software, ensuring the successful installation and functioning of Altitude. In addition to this, the FAQ will also inform you of some temporary configuration dependencies. It is also suggested that you visit these forum boards regularly, as we will be implementing fixes and changes regularly.
For example, one of our key Q&A in the forum, is that you should NOT uninstall IVAP until further notice.
Link to FAQ: http://forum.ivao.aero/index.php?board=1888.0