When trying to upgrade yGhost Solution Suite, you receive an error about the "incorrect database schema" for this version of the product.
GSS 3.x
In this particular circumstance the supported upgrade path was not followed.
Needed to upgrade in the following order: 3.2 RU5 > 3.2 RU7 > 3.3 GA > 3.3 RU 4
Release Notes (GSS 3.3 RU4 - GSS 3.3.12)
Install and Upgrade Ghost Solution Suite 3.3.12 (Supported upgrade paths for Ghost Solution Suite Server)