install one version of wamp with php5 in c:\wamp_php5\
install another copy of wamp to c:\wamp_php4\ and then install the php4 addon.
now start the wamp located in c:\wamp_php4, and use the wamp tray icon to change it to php4.
now you will have php4 and php5 installed. you can only run one instance of wamp at a time tough.
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