1) Go to Host|Extensions, under Modules, click on edit for Smith.Buynow.
2) Under Module settings, change the Business Controller Class to Smith.DNN.Modules.BuyNow.ProductsController
3) Under Package settings change the Email Adress to support@smithcart.com
4) Click Update Extension and Is Searchable should update accordingly.
Both of these settings should be corrected in the manifest for the next release.
I hope this is of some help to you.
Dwayne