If you are using Netscape Navigator, you download the file that was created specifically to work with Navigator. If you are not asked which browser you are using, don't worry. It just means that the download site is smart enough to determine which browser you are using and will automatically install the proper file. If you are unfamiliar with downloading software, read the How-To on Downloading Files . When you get to the RealAudio site, you may notice offers for free beta software.
Beta programs are software programs that are still in the testing phase.
The company wants to get as many people as possible involved in helping to test the program. My advice here is to download the free player first. After installation, if you find that you use the player a lot, you might want to upgrade to the Plus version. The free player will give you everything that you need. The Plus player will add some nice bells and whistles.