I initially installed a current version of wamp (php 5.3) but I have to use php 5.2 for my current project. I downloaded the addon for php 5.2 and installed it. I Quickly stop all services as well as in the wamp menu I actually do

PHP -> version -> 5.2.11

I restart. Now wamp goes from red-colored to yellow, but never goes from yellow to eco-friendly. I do not see anything relevant within the apache error log. How do i trobleshoot and fix and resolve this?

Thanks, Jonah