IMPACT Precst 10.0.008 is available on the download page. There are three options.
IMPACT Precast:
A complete installation with AutoCAD tools and configurations.
Should be used the first time you install version 10.0.
IMPACT Project Manager:
Project Manager only.
Should be used by all project members without AutoCAD. Can be configured with a free drawing viewer.
IMPACT Precast Patch:
A small installation with the new features only.
Should be used to keep all your previous settings if you already have installed version 10.0.