Security Settings in Excel 2007, 2010, 2013 for Windos
(Important! Read This!)
All files of Excel Power Expander are digitally signed with digital certificates issued by a trusted certificate authority. However, Excel 2007/2010/2013 may still pop up annoying security alerts during startup. Therefore, you are recommended to customize a few security settings:
Go to Excel Options
In “Trust Center”, click “Trust Center Settings…”
In “External Content”, click “Enable all Data Connections”.