I uploaded zenphoto to http://example.com. I changed the folder name zenphoto to gallery. Now when I went to http://example.com/gallery I'm getting 500 internal server error. I also tried to install by visiting http://example.com/gallery/zp-core/setup.php but am getting the same error message.

I'm getting this error message:

[b]Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@example.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.[/b]

You probably forgot to copy the .htaccess file as well.
If you rename the folder Zenphoto is in you should first run setup so it can update the rewrite base in the htaccess file.

Thanks for replying. The issue is resolved. There was some directory permission problem.