Fortisiem Download

Hello guys,
I am trying to download FortiSIEM for the very first time, I select SUPPORT then FIRMWARE DOWNLOADS, and where I am supposed to scroll through to select FortiSIEM is greyed out and a message on the page says, I DO NOT have any registered product. Is FortiSIEM all-in-one Supervisor free or I’ll need to get a license to use it, I want to deploy it in my homelab.

Thank you