The product you need is Rebex File Transfer Pack for .NET.
Here is the purchasing page.
All Rebex products can be bought in standard binary edition or optionally under source code edition (more expensive variant giving you access to the component source code. See when to get source code edition if you are unsure what edition you need).
Our licensing is based on the number of developers that will be writing code that is using the component. So you have to choose your license version based on the number of your developers.
If you only have 1 developer, the Rebex File Transfer Pack for .NET 1-developer binary license is $599.
There is also a 5 developers license for $1399 and Company license for $4199 (allowing for an unlimited number of developers in your company).
All our licenses will allow you an unlimited number of deploys of your program to any number of computers.
Looking forward to your purchase. Let me know if you have any more questions.
See our licensing FAQ, Rebex EULA, Rebex Support Contract for more information.