I downloaded 1.30_NoSource, expanded it, uploaded it to subfolder /testshop, tried to run Default.aspx and got error that looks like a custom error page from Discount ASP:
ERROR: We're sorry, an internal error occurred that prevents the request to complete. Our supporting staff has been notified with this error and will address this issue shortly. We profusely apologize for the inconvenience and for any damage this may cause. You might want to try the same action at later time.
I am running nopcommerce on DiscountASP successully. You should check SQL Server connection string in connectionStrings.config file, and replace it with valid SQL Server connection string. Furthermore, you can modify the customerrors tag in the web.config file to view actual error code. This should be like this