I was just wondering the same thing, and it turned out to be simpler than I expected. You don't even necessarily have to close or stop WAMP.
1 - Install Apache 2.2.15 as a custom install, set the location as 'C:\wamp\bin\apache\Apache2.2.15'
2 - Navigate to 'C:\wamp\bin\apache\Apache2.2.11' and copy the wampserver.conf file to 'C:\wamp\bin\apache\Apache2.2.15'
3 - Left click on the wa
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