Short version: try it free first. Once a license key has been issued, the sale is final.
A license key is a one-off digital item and cannot be handed back. That is exactly why FlySense ships with a full-featured free trial: 3 days and 10 runs, with batch processing, reconciliation and every other feature unlocked. Please run it on your own spreadsheet before you pay. If something does not work during the trial, write to us and we will help you get it working - that is what the trial is for.
Write to 214871177@qq.com with your order number and what went wrong. Include the Machine ID if you already activated. We reply within one business day, and refunds go back the same way you paid.
Please write to us before contacting your bank or card issuer. Not one of the disputes we have seen was anything a single email could not have settled - a dispute takes weeks, an email takes hours.