/sigh this is why i insist on hard copies usually... They dont even offer the version i bought anymore...
They don't sell it anymore but you can still redownload it. I have the original version of Sins from retail but I registered it and it is now tied to my Impulse account forever. Likewise when I got Rebellion they switched to Steam, but the concept remains. As long as I have access to my steam account I can redownload it.