To get to work with v5.2 Gemini software. Do this.
Please follow these steps to update this:
1. Copy the new leapc.dll from the following location (or the location where you have installed the Ultraleap hand tracking software):
C:\Program Files\Ultraleap\VRVisualizer\VRVisualizer_Data\Plugins\LeapC.dll
2. Browse to the DCS World folder containing the LeapC.dll:
C:\Steam\steamapps\common\DCSWorld\bin
or the bin folder in your non steam version of DCS
3. Replace the LeapC.dll with the new file.
4. Restart DCS World and test!
This is from Dan from Leap Motion