Inno Setup Preprocessor (ISPP) is an add-on for Jordan Russell’s Inno Setup writer. More technically communicating, it is an extra layer between GUI & the writer, which before communicating the text points and modifies it in a way it is told by using special directives in the script text. Inno Setup Preprocessor (ISPP) is a preprocessor add-on for Inno Setup. The main aim of ISPP is to change compile-time tasks and reduction the quantity of typos in your scripts.
Inno Setup Preprocessor