Installed and no problem here.
And honestly, who cares how long your computer is up for?
It's not about how long your computer is up for but rather it's something some of us have HATED about Microsoft Windows for YEARS...that almost everything you install wants you to reboot. It gets OLD. REAL OLD. Some of us KNOW that Unix based systems simply DO NOT NEED to reboot to install new software or hardware drivers or pretty much anything. There's a way to remove and reinstall everything without the downright ANNOYING need to reboot (forget everything you were doing and sit there twiddling your thumbs for a few minutes and then restart everything all over again and try to remember if you forgot something; Linux will remember your entire desktop in most windows managers now too IF you do choose to log out or reboot).
The point here is that OS X is SUPPOSED to be Unix based (BSD to be exact) and so there is simply NO EXCUSE for Apple to EVER have to reboot for anything. Apparently, at some point they decided to take a horrible cue from Windows and create OS X routines that cannot be updated without a reboot (why in the world anyone would WANT to do that is beyond some of us when it's so unnecessary for a Unix system) and to make things even WORSE, the Windows version does NOT need a reboot for most updates while the OS X version needs it every single freaking time. What does that tell you about Apple quality control? It SUCKS. But then Leopard told me that the first time I used it (it didn't really get stable until around 10.4.4 or so, which means they released it too darn early).
So as usual the Apple fanboys and apologists can make their usual "so what" replies and "we love Apple not matter what they do" type responses, but guess what? Some of us DON'T CARE if you don't mind it. If I wanted to endlessly reboot, I could have stayed with Windows. Sadly, Windows has FEWER reboots as time goes on while the Mac seems to be getting ever more reboots. Go figure. And despite what some people seem to think, Safari is *NOT* part of the Apple operating system like Explorer is for Windows. The finder (which is rather out of date and limited; try the commercial software "Pathfinder" for Leopard if you want to see what Leopard's finder SHOULD have been) is the analog to explorer on Windows. It's not part of Safari or rather Safari is not part of Finder (whereas Explorer IS part of Internet Explorer). So there should be no need to reboot for a Safari update any more than for installing an update of Firefox for the Mac (which does NOT require any reboots).
Humor me. Why shouldn't I use Safari.... or better yet what makes firefox better?
Why don't you try it and find out for yourself? I used Safari on my older PowerMac until Firefox3 came out and I've barely touched Safari on that Mac since then (I have to use it on my iPod Touch seeing as they won't ALLOW any competing browsers on it). The main gist of it is that Firefox is set up to be the browser YOU want it to be instead of the browser they want for you. I can change almost any appearance or functionality issue inside Firefox to behave the way I want it (between Themes and Add-Ons, almost everything is covered). I can't change SQUAT in Safari and I can only add a few 3rd party add-ons, some of which want money (1password is the worst; they want an obscene amount of money to do what a free add-on for Firefox can do). Everything is free for Firefox and most of it is cross-platform. So when I use Firefox on my PC (running either XP or Linux), it can look and behave the same way or just behave the same way but look like Safari if I so choose. Safari is limited, works with fewer sites and is not open to modify yourself (WebKit is, but WebKit is not Safari while Safari IS WebKit so-to-speak).