Hello and thank you for your effort. I have just bought the GTN 650 and installed it in XPL 10. I installed the 2.4.0.0 version from the official RXP store, not the release candidate from this forum.
During installation I got the trainer install error, but I continued the installation. After finishing the RXP installation I manually unzipped and installed the trainer which the installed downloaded. I did not change any paths, and this is the only Garmin trainer installed.
In ProgramData/Reality XP I see foru .dll and one .rxp file.
My rxpGTN.xpl.log contains only 17/04/15 18:52:38.748 08836 - ] # win.xpl version 2.4.0.0
My rxpGtnSim.dll.log contains only 17/04/15 18:52:43.370 08836 - ] # rxpGtnSim64.dll version 2.4.0.0
Windows 7, latest X Plane 10 version here.
After loading my Carenado C172 in the X-Plane at LOWI, I was able to show both of the GTN units. They powered up. I see the home page, and buttons Traffix, Default NAV, Flight Plan, PROC and Nearest were tested and work (subsequent menus appear, I was able to start a simple LOWI DCT LKPR flightplan and even Review it in the Flight Plan menu.
The problem is that when I click either Map or Terrain, the unit freezes. No chance to use anything else than until Xplane restart. The Map button remains blue after clicking it, the Terrain button not. Tested twice with XPL restart, both units same behavior.
Any ideas? If you need any testing or debugging, let me know.
Pavel