Thanks alpha-bravo. That solved the problem. For those afraid to install the unstable build, you don't have to. The installer (.exe) is just a form of ZIP file. So, just open the installer with a zip manager (I use Bandizip), and navigate to the folder $2\Bin64\Plugins inside the .exe and voilá, there is the TrackIR_rF2_Plugin_x64.dll. Copy it to your Plugins folder in the game and you're set. Only thing I noticed is that it takes a while to be initialized once the game is launched (almost 10 seconds), but I guess this is the normal time required to activate the plugins. Cheers.