Check if a program exists before installing with Inno
To check if a program exists before installing with Inno add the following code section to the installer script. In this example we will be testing for the file "c:\Example\Test.exe". If the test.exe file exist a message box showing "Program Already Exists" will be displayed and the installer will terminate.
[Code] function IsMyProgramInstalled: boolean; begin result := FileExists('C:\Example\Test.exe'); end; function InitializeSetup: boolean; begin result := not IsMyProgramInstalled; if not result then MsgBox('Program Already Exists', mbError, MB_OK); end;
Download the installer script IsMyProgramInstalled.iss