Avangate is just a payment processor. I doubt they will issue you a refund. I think they will instruct you to contact the software seller for them to initiate a refund. 
If you don't hear back from FlashFXP support, you could request a chargeback from your creditcard company. 
 
In FlashFXP go to Help menu, then About and then Details. Paste here what you see there.
		 
		
		
		
		
		
		
			
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