From Forum Nokia Wiki

ID	TSS000174	Creation date	May 8, 2003
Platform	Series 80 2nd Edition	Devices
Category	Symbian C++	Subcategory	General

Keywords (APIs, classes, methods, functions):

Overview

How can I launch the installer from code to uninstall an application?

Description

The following code demonstrates how to launch the installer to uninstall an application. SIS files in the "c:\system\install\" directory contain information about the files installed for a certain component. The uninstallation removes all files specified in the original .PKG file and finally deletes the .SIS file from the install directory.
#include <apacmdln.h>

1. include <eikdll.h>
2. include <instapp.h>
   CApaCommandLine* cmdLine;
   cmdLine=CApaCommandLine::NewLC();
   cmdLine->SetLibraryNameL(
   _L("z:\\System\\apps\\instapp\\instapp.app"));
   cmdLine->SetDocumentNameL(
   _L("c:\\system\\install\\MyApplication.sis"));
   cmdLine->SetCommandL(EApaCommandRun);
   cmdLine->SetTailEndL(KUninstallCommandLineTail);
   EikDll::StartAppL(*cmdLine);
   CleanupStack::PopAndDestroy(); // cmdLine