According to Gen 8.6 technical requirements, Oracle 18c and 19c are supported databases on a Windows platform for CSE encyclopedia, but the Edition is not mentioned.
Is it ok to use either the Oracle Enterprise Edition or the Standard Edition?
Release : 8.6
Component : CA Gen Client Server Encyclopedia
surpasses the Standard edition with its inclusion of fine grained auditing, transparent database encryption, and extensible key management
Both Oracle Enterprise Edition or the Standard Edition will work with the CSE.