What did you do in this step:
set up the config.php file
If you go directly to /install.php and get redirected, check to make sure your config.php is not re-directing to the original site URL.
Also check that the sub directory is accessible via the web - put a file like domain.com/subfolder/touch.html in there and see if you can browse to the file.
Hardware and performance
Options for a Multiple Site Setup (40+)
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