What installers on which Windows version?
I've never had to reboot after installing software on any modern (post 2k) OS unless it requires special drivers.
Install any software, and it'll ask you to reboot. Dunno why, probably because the people who wrote the installer software were retards, and were writing for retards.
Then there's DirectX and other shit which will tell you you HAVE TO reboot and not give you a cancel/later option. What's next? A 1 second timer so you can save your work?
When something's already loaded in RAM, updating it can bring bad news. So you update it before the system starts, after a reboot... That's the only time you should need to reboot for installing software, really.
Huh?
Don't get it, I'm a nube to all this scripting stuff.
There's a bug in the setup and a fix is in the works.