This can be easily checked by looking at the Pharos key in the Windows Registry.
Run regedit and find the entry:
The Data field, for each entry, lists the build number for each component (which can be checked against the version).
Compare the build numbers listed in the Data field to the list below:
For example, if Pharos 7.2 is installed the Data field should show 4273 (or higher if any hot fixes were applied) for each entry.
If the numbers shown in the Data field are not at least as high as the current version build number (above), then that component needs to be upgraded.
NOTE: All Pharos Servers and Pharos Stations need to be at the same Pharos version.