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Double-Take requires Windows PowerShell version 2 or later. This version is installed by default on newer Windows operating systems, like Windows 2008 R2 and Windows 7, or newer updates like Windows 2003 Service Pack 2. However, it has been a part of the Windows update functionality since June 2010, so you may have version 2 installed even if you are running an older Windows operating system.
If you are uncertain which version you have installed, check the PSVersion property of the $PSVersionTable automatic variable. This variable does not exist in PowerShell version 1, so if the variable returns nothing, you have version 1 installed. If you have version 2 installed, you will see a table of version information, showing your major and minor version numbers.
