Hello, I have an InstallScript Project (not MSI). We create a logfile using GLOBAL variables, i.e.: #ifndef CULOGFOLDER #define CULOGFOLDER FOLDER_COMMON_APPDATA ^ "MyCompany\\Installation\\" #endif #define LOGNAME "MyLogFile.log" I have a function CreateLogFile()  that is called in OnBegin() We want to be able to allow the customers  to create the logfile in a custom folder, instead of in the default C:\ProgramData\MyCompany\Installation folder. Within the CreateLogFile() method we tack on a folder name that has the date_time : GetSystemInfo(DATE,nvResult, svDate); GetSystemInfo(TIME,nvResult,svTime); StrReplace(svTime,":","",0); svFolderName = "CUUpdate" + "_" + svDate + "_" + svTime; LogFolder= CULOGFOLDER ^ svFolderName; I have tried almost everything I can think of: I have looked at the setup.exe command line parameters: https://docs.revenera.com/installshield19helplib/helplibrary/IHelpSetup_EXECmdLine.htm I have tried call the installer with: setup.exe /z"CULOGFOLDER=C:\ProgramData\MyCompany\NewFolder" setup.exe CULOGFOLDER=C:\ProgramData\MyCompany\NewFolder setup.exe /f2"CULOGFOLDER=C:\ProgramData\MyCompany\NewFolder" etc. But nothing works... Does anyone have an idea on how to 'change' a global variable or define from the command line? Much appreciated, Steve ... View more