Before you click that download link, I suppose I ought to say that SkunkWorks is provided as is, without warranty of any kind, and if you choose to use it, you do so at your own risk. Any damage or loss your character may suffer while using this program is beyond my control and therefore not my responsibility.
That said, download the SkunkWorks install package from here:
If you don't yet have Decal, get it here:
If you're not running Scripting 5.6 or better, get the update here:
If you get a message saying you need to update your Windows Installer, do it here:
Finally, don't forget to check out the UserWare section for scripts and addons contributed by SkunkWorks users.