If you were using the ISPP precompiler version of InnoSetup, you may find that the InnoSetup Action no longer works with the latest 5.4.1 release of InnoSetup.
This is Not a bug in FinalBuilder, so please don't report it to as one.
The Authors of InnoSetup decided to integrate the pre-compiler into the official release (which I fully support), however they have chosen to remove some functionality that we use to access the pre-compiler. You will have to use the "Use Command Line Compiler" option... and no progress will be provided for the action (as was the case when not using the command line compiler). This option is available in the most recent FB6 builds and all FB7 builds.
I have asked the authors to re-instate the previous functionality (but not holding my breath based on the response so far).