I assume this matters in case you might later need to reinstall? Just make a local copy of the installer after you download it then. Even if you forget to do

I assume this matters in case you might later need to reinstall? Just make a local copy of the installer after you download it then. Even if you forget to do this, prominent files like this don't disappear from the Internet; at worst you could torrent it. (And that should be legal since I don't think the software expires.)