Enter an email address (does not have to be valid; test@test works fine)
Click Send
Still while in the Endpoints page, change the Status drop down filter from "Active" to "Pending Install"
Expand the details for this Pending Install invitation to the invite for test@test by clicking the single chevron (" > ") to expand the entry.
Copy the value listed next to "v1.x-2.x Install Code" (there is an expiration associated with the invitation which is 7 days after invitation being sent)
The Installation Code above is used for an attended or User Interface installation.
The Installation Code can only be used once per invitation.
The v1.x-2.x Company Registration code available from Endpoints → Sensor Options → Company Codes can be used for attended and unattended (command line) installation of the correct Sensor Versions.