The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
https://www.vcwsecurity.com/cyberoam-eol-eos-information?utm_source=TEST&utm_campaign=5ec9f8a809-EMAIL_CAMPAIGN_2018_08_29_04_02_COPY_01&utm_medium=email&utm_term=0_d399d46f63-5ec9f8a809-