Getting Pie
An implementation of Pie is available from the Racket package system. To install Pie, first install a recent version of Racket. Open DrRacket and select "Install Package" from the "File" menu. In the package name field, type pie and then click the "Install" button.
To use Pie, begin a file with #lang pie in DrRacket.
Errata
There are known errata.