Nexus

I'm trying to download the bulldog autogyro. The installer started slowly, and then the speed keeps jumping from around 2MB/s to zero and back again. The it got really slow and then finally stopped at around 300MB. I shut it down and restarted and it was even slower. I shut it down, rebooted my PC and restarted it again. It started to run a bit quicker this time but then stopped and restarted the download by itself. Now I noticed that the download got over 100MB and then rewound back to 30MB. What the hell is going on with this thing? It's been running over 2 hours now and is not progressing. Is there any way I can download it without this junk installer?