Well, the easy answer is that it's free.
For help, keep watching for updates at http://www.frostwire.com/index.php?title=Main_Page and listen to birdy.

For older versions, go to http://sourceforge.net/projects/frostwire Look around until you see a way to view all project files.

To cut down on interference with other online activities, these two things:

1) Clean up your current set up by deleting the incomplete folder before you start FW this time (you might want to back it up somewhere else in case it had some really important files).

2) Open FW and set FW's upload options bandwidth slider to 85% of your tested speed (ask your ISP's help desk for that info).

3)Download just 2 or 3 files at a time while doing heavy browsing.