Can't find file to patch at input line 11, File to patch:?
The patch is trying to alter the install.php file that comes with Drupal, but it doesn't find it. That file is normally removed, once Drupal has been installed. 

What the command line is prompting for is the name of the file to patch, in the case has been renamed, or moved in a different directory.

Keep in mind that the SimpleTest module should not be installed in a production server, but in a development site.