Very important; After you install the software, please do the following rearrangenments in your windows "control panel". -Open the regional settings from the control panel. -Click "number" submenu at the top. -At the top "Decimal Symbol" prompt, enter dot (.) instead of comma (,) The decimal symbol should be Dot (.) If you don’t convert this "decimal symbol" to dot (.) then you cannot be able to edit "custom percent menu" in the software.