mIRC downloads to whatever folder you have set up in the options. However, with Vista, you are limited on where you can save to, so if it's set to a location that is protected, you will probably get an error or else it just won't be saved at all. I don't have Vista (I refuse to use it), so I don't know what exactly you'd see, but those are the possible outcomes. As for browser issues (opening links in mIRC through a browser), that won't work in Vista until the next version of mIRC.
