I just installed 0.1.0.10 no problems. win7 x64, first install of the GMT.
I've loaded a model but haven't tested maps yet. Also, I have a few feature suggestions for the future:
Toggle Human Scale reference: Similar to how Marmoset Toolbag's feature, it would be good if there was a toggleable human scale reference in the viewport, so you could tell if you object is scaled correctly. Perhaps for Grimrock it would make more sense to have scale in meters though, with 3m being the top of the roof and 0 being the floor.
View vertex normals: Possibly unnecessary, but it's a good way for those who don't have Marmoset Toolbag or any other method to see where vertices split. At the moment I can see my model and that smoothing groups are working, but I'd need to check the model in Marm. if I wanted to see all the splits.
Sensitivity adjustments: This is probably just because my model is scaled up to be HUGE, but moving around is really slow. Possibly unnecessary since most scaled items will all be < 3m square.
Again possibly unnecessary, but wireframe mode. I don't particularly need it since I have marmoset but it might be useful for others, esp if they forget triangulation.
Also, should list keyboard commands, I just stumbled upon the u/i/o/j/k/l keys then
Is there a way to move the scene light? If you download the Marmoset Toolbag trial you could have a look at the keyboard setup they have - they use CNTRL to move model, shift to move Sky, alt to move camera, shift + alt for camera (snapped), shift + control for snap model.
Just some suggestions, really awesome work so far, thanks for doing this