Installing Lightroom presets can be a little tricky but Mat from Lightroom Killer Tips has recently found out, there is a far easy way.
Just Drag and drop the preset file on to your Lightroom icon in the dock.
Of course that is if your a Mac user. If you’re a Windows user then double click the preset file. It will most likely say it does not understand the file type. Associate the file type with Lightroom and then double click will install it.
Have not tried it in Windows, as I do not have a Windows machine handy to test it on, only Apple Mac’s, Linux, and Solaris at present. Must rebuild that Windows 7 test machine of mine.