WARNING _ DOES NOT WORK IN MAVRICKS!!!!

WARNING. I purchsed the app yesterday ($100) and after updating to Mavricks this morning it will automatically crash and stop recording at around 2 minutes. When I contacted Camtasia (TechSmith) Cuctomer Service they said they do no support Mavricks and will not offer refund since I purchased through the Apple app store. Does anyone have any idea how to get a refund out of the app store? Redicuouls.

Nicknamesarerediculous about Camtasia 2