Workaround

Delete "shadow.iu" after Intelligent Updater's download is done and re-create it after the definitions are updated with the IU as shown below:

Solaris/Linux:

1. Login to the SSE installed host as a root.
2. On command prompt, change directory to the definitions' directory:
   
   # cd /opt/SYMCScan/bin/definitions/AntiVirus
    
3. Delete shadow.iu by disabling setup-iu.sh.
   
   # sh setup-iu.sh disable                     // shadow.iu is deleted
    
4. Execute downloaded symrapidreleasedefs-unix.sh.
5. Re-create shadow.iu by enabling setup-iu.sh.
   
   # sh setup-iu.sh enable                      // shadow.iu is re-created 

32-bit/64-bit Windows:

1. Login to the SSE installed host as Administrator.
2. On command prompt, change directory to the definitions' directory:
   
   32-bit Windows
   %SYSTEMROOT%Program Files\Symantec\Scan Engine\Definitions\AntiVirus
   Default: C:\Program Files\Symantec\Scan Engine\Definitions\AntiVirus
   
   64-bit Windows  (About 64-bit Windows IU's detailed information, see KB: Intelligent Updater not working with Symantec Scan Engine 5.2 installed on 64-bit Operating System.)
   %SYSTEMROOT%Program Files (x86)\Symantec\Scan Engine\Definitions\AntiVirus
   Default: C:\Program Files (x86)\Symantec\Scan Engine\Definitions\AntiVirus
    
3. Delete shadow.iu by disabling setup-iu.bat.
   
   > setup-iu.bat disable                     // shadow.iu is deleted
    
4. Execute downloaded IU definition (*.exe).
5. Re-create shadow.iu by enabling setup-iu.bat.
   
   > setup-iu.bat enable                      // shadow.iu is re-created

 NOTE:

This document assumes the environment in which IU is automated with some scripts and cron jobs on LInux and Solaris, with batch scripts and Windows tasks on Windows. Add the above two steps, disabling and enabling setup-iu.sh / setup-iu.bat, in your script.