Steps to upgrade PHP from existing 4.x version to latest 4.3.10 version on Ensim Pro 4.0.0 for Windows server:
 
(1) Download PHP 4.3.10 zip package from PHP site:
 
http://www.php.net/downloads.php

(2) Create php-4.3.10 folder on C: drive
 
(3) Unzip the contents of PHP-4.3.10-win32.zip file to c:\php-4.3.10 folder
 
(4) Take the backup of existing PHP files (C:\Windows\System32\Inetsrv\php).
 
(5) Copy unzipped files and folders from PHP 4.3.10 folder to C:\Windows\System32\Inetsrv\php folder . (Overwrite existing files)
 
(6) Upgrade completed.
 

To test the successful upgrade, create phpinfo.php file in default website data directory (C:\Inetpub\wwwroot) with following PHP code, and browse it
 
<?
phpinfo()
?>

Note:  For upgrade of PHP on v3.6 of Ensim Pro for Windows 2003, refer kb article no 1910.