can i try out avast pro

i have avast 6 free and i am thinking of buying avast 6 pro but can i get a trial with out getting rid of avast 6 free from my computer like a 30 day day key i can put in to avast so i can give the avast 6 pro a trial

You can test avast! Pro or IS 30 days for free.
You can’t have the free version and Pro/IS at the same time.
But you can reinstall the free version after the trial period ends.