I collaborate with a guitar player, and we both have GR5 on our computers.
What works for us is that we save any GR5 sounds we make as user presets, then send those along with our projects in a compressed folder.
At the other end, we take the GR5 presets and save them in the folder Guitar Rig looks at for presets, and then they load up just fine.
On my computer, the location for these is:
D:\Users\Robert\Documents\Native Instruments\Guitar Rig 5\Sounds
(I moved my user - Robert - to the D: drive, but otherwise, this is where presets get saved)
Does that help?
Bob Bone