If you using lab you can use viptella sdwan license around available in google to test the lab
here is my SD-WAN latest version testing few back to revie :
https://www.balajibandi.com/?p=2028
organization-name viptella sdwan should work
some components must be able to talk to Cisco's online license validation services?
yes they do if you have smartnet account, and vManage directly sync with Device details using PNP and you can downloads the config and boot your device with sdwan.cfg that directly interface wth vManage and sd-wan components.