This is all pretty strange. I made sure no other programs were open and ran it again, and it still got stuck at 73%. After a while I closed the installer. I went to delete the folder it creates in Program Files but it wouldn't let me, saying a program was using the files, but I saw no installer process working. Out of curiosity, I opened the .exe in the Corsair folder, and it actually opens the iCue program. It even lets me select lighting options, but when I set key assignments for the side buttons they don't work. I checked a video of someone doing it on youtube, and I was doing the exact same way. Though I imagine its due to the installer not working properly.