The download-by-redirect feature works like this:
1. it checks that the download source file can be located
2. it generates a random folder name, starting with a dot
3. it creates that random folder inside the "pub" folder
4. it creates a symlink inside that folder, which points to the origin source file (see #1 above)
5. it redirects the customer's browser to that symlink so that the download can take place
Since yours is completing 1, 2, 3 properly, but not completing #4, it indicates that something is preventing the symlink from being generated. That's something caused either by permissions or server restrictions. That's something you'll have to work out with your server administrator / hosting company.
Since your post quoted above, you've made other posts and sung several different tunes with different stories. It's unclear what specific problem you're facing, especially since you said you dropped Zen Cart in favor of something else, blaming the software for not being compatible with your unique server configuration.




