After trying and completing the steps from KB article
We are still receiving the same error message "SPC-INT-20074: Insufficient privileges on <Hostname>" during the installation of Spectrum 10.4.3. (20.2.7).
As a new requirement in Spectrum 10.4.3 onwards, the sudoers file needs to contain the specific hostname where Spectrum is being installed to.
Release : 10.4.3
Component : Spectrum Core / SpectroSERVER
Where spectrum is the Spectrum Install Owner account and spectrum01 is the hostname