Do you have the Products_Search.php page in your site? Have you tried updating the link so that it goes to the page with a capital P instead of the lowercase one? You can get this error if you are trying to go to products_Search.php when the name of the page is actually Products_Search.php. You can just do find and replace for the lowercase version and replace with the upper case version.
As for the views did you apply the updated file for the views that is available from the download area? If you do not have this fix in place and try to run the installer you should get an error if the views could not be created. If the fix is in place you will not need the views.