This file has been created by Advancing Quality Alliance (Aqua) and is safe for you to use. Excel will block the macros from running for your safety. In order to enable the macros, please do the following -
- Go to Windows Explorer and find the file you have downloaded
- Right click on the file and select Properties from the pop-up menu
- At the bottom of the General tab should be a security section which says "This file came from another computer and might be blocked to help protect this computer"
- Tick the "Unblock" box next to this statement
- Open the file and you should be asked if you want to enable macro content. Click the button to enable content
This advice comes from the official Microsoft help site and you can read the full article (with screen shots) by clicking here.