My customer wants to upgrade its ACS 2.6 to 4.2 without loosing its database. From the documetation I've found upgrade path: ACS 2.6 ---> ACS 3.x --> ACS 3.3.x -----> ACS 4.1.1.23 or ACS 4.1.1.24 ----> ACS 4.2However how could I get the old upgrade p...