Teach on how to create a setup file for vsto updates

I have a vsto project and I want to give it off in the following way 1. Download and install from the website, with the user entering the email and gaining a key. the key array will be predefined in the vsto. 2. The software must be valid for 6 months only, and no option should be working. 3. The software must update remotely from the website 4. Any more ideas you may think off