If you are unable to download and run the .exe application files please download the tool here (.zip). When you have downloaded the file, you will need to unzip/'Extract all' documents for the tool to work correctly.
Please note, to use the tool you will also need to install the 'qtp' XLL Excel add-in. The Queueing ToolPak 4.0 does not work on the following platforms: Macintosh, 64-bit Excel 2010.