Unchecky warns you that you may be about to install unwanted software when you attempt to accept the license agreement for the game. Tribes: Ascend is a free to play first person shooter. At the time of this post, the installer doesn't include any bundled software.

The installer is located here: http://www.hirezstudios.com/tribesascend/home/sidebar/tribes-download (approx 50mb)

1. Detect a downloader / installer of this type.
2. Determine the URL the downloader intends on using by examining the EXE. (hopefully this is possible)
3. Terminate the installer / downloader (possibly notifying the user.)
4. Download the MSI / installer directly.
5. Execute the downloaded file under the same user account the downloader was initially executed as.

I've had the exact same problem as this guy

http://unchecky.userecho.com/topic/732301-your-update-to-the-hosts-file-deletes-any-valid-entries-in-the-file-not-acceptable/

I had a LOT of custom entries in my HOSTS file, including a lot to get rid of ads, but in the past couple of days I've noticed I am seeing ads again, so I looked in my HOSTS file, and the only entries are for localhost and Unchecky, as much as I liked it, and it seems to work, if it's destroying my HOSTS file, I have no choice but to uninstall it!!

There isn't a backup of the HOSTS file at all, and I'm not sure I have a recent one myself, I hope you don't just dismiss this like the other guys, and actually have a look, obviously it's a REAL BUG, and causing REAL PROBLEMS, could you at the least attempt to work out why, rather than just dismiss it because of "a lack of feedback", not that I can think of what else could be added. If you need I can include a copy of the hosts file since it's now very short ...