Difference between Flowmaster V7 and V8.Yes, it seems the two versions of the software are completely different. The latest one appears on the Bentley website, while the older one is discussed on different websites. You can check about FlowMaster V7 on the following website, which appears to be the developer of it, and for the version 8, use the Bentley's website.
Use FlowMaster to quickly perform hydraulic calculations for dozens of element types, from pipes and open channels to drop inlets and weirs. The use of FlowMaster is approved by FEMA for normal depth calculations to establish base flood elevations for Letter of Map Amendment and Letter of Map Revision based on fill requests along streams, creeks, and rivers designated as approximate Zone A on NFIP maps.