If you are installing version 3.x under Zen Cart 1.3.9x the first thread would be the correct one.
If you are installing version 4.x under Zen Cart 1.5.x this is the correct thread.
This will happen if you needed to login again (the login blocks the installer messages) - or - if the auto-installer already ran and thinks everything went well.
Blank pages usually indicate something went wrong. Either with the uploaded files or something else. Check for any "debug" log files. I am getting a blank page is a good article on where to look. Looking at (and optionally posting) the most recent debug log (if any) will usually tell you where and what went wrong (in PHP speak).
Internal Server Errors (HTTP 500) are a bit different from a blank page... To debug this one would need to look at the webserver's error log.
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