Probably the pop-up blocker in IE7 with medium or high setting. I've had to download files in that matter before myself due to IE7's annoying characteristic of blocking popups/downloads the user iniates.
I just found that out CG. I've been on 1.7.1 since the year dot, and decided to see if the download was OK by updating to 1.7.2 myself.
I spent ages searching the forum for a link newer than the 1.7.1 level without success until I eventually found it where you describe in your post ---------- but I'd already posted my comment before I found that out ! (I've always got everything through forum links, HnS iR etc and had no idea that there was anything not available through that route)
There's a plethora of resources available on the site that aren't linked in the forums - for instance all the downloads (dl.php?id=xx) are only linked from their respective release posts on the blog (and other sites, of course) since I never got around to creating the archives page...
You can see all the different programs by inserting a different number from 1 to 15 at the end of this uri: neosmart.net/dl.php?id=
One of the first NST programs I ever wrote, never got past beta 1 due to a number of non-technical reasons... intended to speed up system boot times by converting startup applications that don't have a user interface to system services; stuff like Adobe Speed Launcher, Java Update Checker, system cleaner tools, all the weird junk programs install, etc.