PowerShell 2.0 is already preinstalled by default. You do not need to download it.
PowerShell 2.0 is not installed by default and must be added via the WMF update. Download and Installation Guide 1. Prerequisites download powershell 2.0 for windows server 2008
Before downloading, verify your exact operating system version: PowerShell 2
This is the most reliable way to find the standalone installer for both x86 (32-bit) and x64 (64-bit) architectures. download powershell 2.0 for windows server 2008
You need .NET Framework 2.0 SP1 or later (version 3.5 is recommended). 2. Download Links
Ensure your server meets these requirements before starting: You must have Service Pack 2 (SP2) installed.