You should read this article which explains, step by step, the authorization procedure.
No, you can authorize a computer without any hardware key. You can also put your license on a USB stick.
No, Overloud produts are installed with a proprietary authorization system. Read more on our authorization page.
You can authorize up to three computers and a USB stick with a single serial. You can also deauthorize your installations and move them into new computers.
If you are a ProTools 8 or 9 user you have to install the RTAS plugin version. If you are a ProTools 10 or 11 user you can install the AAX plugin version.
You have to install the AudioUnit (AU) version of the plugins.