Here it looks like the last update in texlipse code was in 2012. Here it says that the most updated version for download is from 2011. And lastly, here it is said that the last update was in 2013. So my question is where can I download the most updated version and what is the reason for this discrepancy?
I would guess, 2011 is the date of the last release, the repositories were indeed not updated since 2012, but there were some changes in tickets in 2013. I might be wrong, but this explains the phenomenon.
About downloading: I believe, there is not direct download from the latest changes but you can download the source and build your own version.