Hello, you get a key in two ways:you don't create an account, and you use the one indicated on https://www.samson-connect.net: email@example.com and 38540-DEBE1-44187-A67B7-08471 you create an account, and you use your email address and the key you receive at that email address when you download the installer.
You can also have the key sent to you in the My SAMSON / Account page on SAMSON Connect:
SAMSON and many SAMSON Elements are free, yes. Note that you need to create an account if you want to choose which SAMSON Elements you add to your SAMSON.
Hope this helps,