karen@boomobile.com,
I don't think this mod will work for v4.0 of x-cart. There is another post by MonkeyClan for earlier versions of x-cart. Just click here for implementing the earlier version of this FREE GIFT module.
unimatrix,
I think v4.1.7 is pretty similar to v4.1.8 so I think this mod might work for you. But don't take my word for it, because I'm not really too familiar with that version. In any case, make sure you make backups before implementing this mod.
- MoonDog -