If you purchased FS-ATC-Chatter from Sim Market, FlightSim.to, or the FlightSim.com store you just need to log into your store account and go to the download page for the FS-ATC-Chatter order.

If you purchased FS-ATC-Chatter here on the Stick and Rudder Studios website you would have been mailed a Gumroad receipt to your email address. That receipt contains a “View Product” link that you can use to download the product again.

If you lost your receipt you should be able to retrieve it from your Gumroad library https://gumroad.com/library if you had created one. You can also obtain a duplicate receipt here: https://gumroad.com/charge

As a last resort, Gumroad can resend your receipt. Simply contact Gumroad at Support@Gumroad.com. Please note that it may take a day to respond to your email depending on your time zone.