You can download it from
Sprint - Software Downloads - Select your device type or
http://www6.sprint.com/downloads/spr...s2.25.0046.exe
I'm literally ecstatic about the software. I canceled my broadband @ home so using it daily anywhere from 6-12 hours. I use it for my BB and my children use it for their Sprint phones, as well. I never lose connection and it's always fast and reliable.
Edit: If you use more than 5g/month data transfer, you'll need to purchase the Phone As Modem add-on for $15/month; less data transfer monthly is considered casual. I do know that PAM is not available for Sprint customers with Simply Everything, but I believe you can still tether (casually). I, of course, use LOTS of data transfer so I really don't mind the $15 price tag.