Microsoft .NET Framework 4.5.2+ : Download
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The SPE module installs like any other for Sitecore.
Following the installation you'll find these new items added to the Sitecore menu:
Sitecore -> PowerShell Console
Sitecore -> PowerShell Toolbox
Sitecore -> Development Tools -> PowerShell ISE
Sitecore -> Reporting Tools -> PowerShell Reports
You may also clone the project from GitHub and compile it. This allows you to access the latest functionality without waiting for a new release. See the following contributor guide for instructions on how to get up and running.
See the troubleshooting section here