The below requirements are for both BPM on Cloud and On-Premise.

• IBM BPM Version 8.5.7 CF 2017.03 and CF 2017.06 and greater
• SPARK UI (CF 2017.03) or IBM BPM UI (CF 2017.06)
• An external database is not required.  However, SPARK Salesforce supports Microsoft SQL Server, Oracle, and IBM DB2 databases