Currently, the recommended firmware version is 2.56 b2 for non-encoded Helixes and 2.61 b8 for encoded Helixes. You can download the latest version of the Letus/BaseCam GUI software from the locations below.
GUI for firmware version 2.43 b6
GUI for firmware versions 2.55 b9 or 2.56 b2
GUI for firmware version 2.61 b8 (used for encoded Helixes) (GUI is labeled as version 2.61 b7, but is the correct version for firmware 2.61 b8)
GUI for firmware version 2.63 b0 (used for encoded Helixes) (GUI is labeled as version 2.62 b9, but will work for versions 2.62 b8 to 2.63 b0)
Directions for installing the software are available below.