I would like to suggest that you post on the eSchemes Deluxe Web page where to place the eSchemes deluxe key once the key is received. The average user will not know that they can view the key with a text editor to see where to install. Also, the location is not correct, at least for eCS 2 RC4. This information could be place with your information on components needed and how to install.
When you receive your registration key for eSchemes Deluxe, copy the key to you "<drive>:\home\default" directory.