The 7-day trial is the main compatibility window. If a first purchase cannot be used because Mac Mouse does not work with your supported macOS version or mouse setup, contact support with purchase email, macOS version, mouse model, and issue details.
Refund requests are generally considered within 14 days of the first purchase when there is a clear compatibility, duplicate purchase, or billing error. Refunds for abuse, repeated purchases, or policy misuse may be declined.