GETSTAMPS32.EXE (Windows) or getstamps.sh file (UNIX) is missing from the system.
In the end of FixPack install, the following error message is displayed by the installer:
Uninstalling ISTK 4.2 FP4/FP5/FP6 results in GETSTAMPS32.exe (Windows) or getstamps.sh (UNIX) file being removed from the system. Subsequent FixPack install errors on missing GETSTAMPS32.EXE or getstamps.sh file.
Resolving the problem
This issue has been addressed in ISTK 4.2.0 FP7.