'Change active PHP version without using wamp tray icon

Is there a way to change active PHP version 5.5 -> 5.6 in wamp 2.5 without using the tray icon of wamp. Currently can`t start wamp, not yet sure why, attached the error message below.

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Right now I only start wamp apache and mysql thru windows services.

PS: php 5.6 has been installed.



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