http://get.secondlife.com will now immediately fetch you the latest release version of Second Life, no questions asked.
We figure out your operating system based on transparent information that is included in every HTTP web request made by a common browser. However, as with all “smart, convenient” software, it can guess wrong. If you need a specific operating system version:
For those of you that may be wondering, this is actually an old side project of mine that I never got around to until recently. It did not take up anyone else’s time but mine, and all bugs are my fault, so you should blame me. I hope you find it useful when you’re on a new computer that doesn’t have SL installed. (say, at a convention?)