Woh that is operating system level stuff. I do not know how nsis works under the hood, this got to be a Numsgil question. As long as the program runs should be fine though.
edit: Did some digging on it online. Looks like it is attempting to "register" some library that does not need to be. So it is doing more work installing than it should.
Fun way to mess with new physics is high y-gravity, no screen wrap, and load up plenty of robots with null dna. Than adjust collision elasticity and the simulation should react appropriately. This is version 2.48.31. Welcome back Testlund.