If you are not happy with any of our calculators, just tell us what seems to be the problem and we will happily give you a full refund within 7 days of purchase.

This is likely because Excel automatically blocks Excel documents, Discover Done is a trusted provider, and all our calculators have valid digital certificates. If you find the file doesn't have a valid certificate, please make sure the file was downloaded from our website directly. You can also try manually adding us as a trusted provider by following the instructions on the Microsoft website.(https://support.microsoft.com/en-us/office/add-remove-or-view-a-trusted-publisher-87b3d5a3-b68c-4023-87c4-7cc78a44d7ed)