How to updrade version PHP from php 5.2 to php 5.3

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AppServ 2.5.10 for Windows
About AppServ Version 2.5.10 for Windows
AppServ is a merging open source software installer package for Windows includes :

    Apache Web Server Version 2.2.8
    PHP Script Language Version 5.2.6
    MySQL Database Version 5.0.51b
    phpMyAdmin Database Manager Version 2.10.3