If you have any technical issue please post in forum. Otherwise, if you have any pre-sale or order related query please mail to support@wpdownloadmanager.com . Again for technical support, if you are already using pro version please post in pro forum and free version users please post here
After purchase, if you see any delay ( very rare case ) in receiving confirmation email Please signup or login ( https://www.wpdownloadmanager.com/purchases/ ). Then go to orders page ( https://www.wpdownloadmanager.com/purchases/ ) and enter Order ID in textbox and click Resolve, then you will have immediate access to your download.