VERIFIED SOLUTION i

How to understand if the 3.1 S02 update can be applied without first installing the S01 update in EngageOne Delivery Audit (formerly known as Mail360 Data Manager

EngageOne Delivery Audit (formerly known as Mail360 Data Manager) version 3.1
Yes, the S02 update can be applied without first installing the S01 update.

S01 was for Services whereas S02 is for DM UI (User Interface), hence they are independent. 
UPDATED:  August 14, 2017