In some situations a Windows PC may not allow TaxCalc to be installed as it claims that it is running on XP, although the computer is running Windows 7 or later.

This will happen if the TaxCalc application is running in compatibility mode for XP. While this situation is unusual it is easily resolved.

• Right hand click on the TaxCalc icon
• Choose properties
• Go to the Compatibility tab and untick the Windows XP compatibility option
• Save this change, and close the window
• Start TaxCalc and run the update as normal from the notifications option

While there is no reason this option should be set, TaxCalc have seen this on a very small number of computers attempting to run the late 2017 update.