I've changed the permissions on it till I'm blue in the face. It didn't work.
I posted the following on the Heart users forum earlier.
I originally installed the Heart version with the captcha but couldn't get that to work either. No captcha device visible and when I removed that and tried to run the stripped down form it activated the download window.
I deleted everything and installed Matt's script. That didn't work either so I then tried an online form creation tool from a couple of sites. Same result.
Last night I copied a working form from a clients site (with Heart). Modified it, but that didn't work.
I then put the original form from the problem site onto another and it worked.
Could it be something not being activated on the server?
I've also just remembered that when I tried to install the script from within the user panel that I had to create a folder for it because when I tried to install it into root it just created two files called: setup_script.cgi and _inone.tar.bz2
I tried to run both these but they just want to download to the sites local folder.