Metastorm BPM uses a four part version numbering system.
...
i.e.
7.5.1.21 = Product Version 7, Point Release 5, Service Release 1, Hotfix 21
To date we have always endeavored to roll up fixes and releases so that a later release will always contain all of the features and fixes contained in earlier releases.
In the event that a fix is released for an earlier version we will endevour to include that same fix in the next available release for the later version. This activity was often seen with the large number of hotfixes released for version 7.5.1 that were mirrored in 7.6, 7.6.1 and 7.6.2.
Our latest release is presently 9.0.1.0 (Version 9, Point release 0, Service Release 1, Hotfix 0).