the originally installed n-13 news script files were completely deleted from original /news folder (in face, the /news folder itself was deleted). then i created a new folder named n13news, into which i uploaded n-13 news script files. and then, i made a new /news folder and put in there my index.php.
so the install of n-13 news script was complete new install.
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Moving the files isn't enough to do a full install. All the information is still stored in the database which would need to be wiped. After moving the files you'd need to run install.php again to install the script properly.