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 Siebel Installation Guide for UNIX > Installing Siebel CRM Server Modules > Installing and Uninstalling Siebel CRM 18.12 Update > 
Verifying Installation
 
Use the following procedure to verify that Siebel CRM 18.12 Update installed successfully. For Microsoft Windows, use cmd. To verify the installation 
- Navigate to the Oracle_Home directory.
 - Run the following command:
- Windows: set ORACLE_HOME=Oracle_Home
 - UNIX: setenv ORACLE_HOME Oracle_Home
  
 - Navigate to the 
opatch location, and run the opatch lsinventory command to check the version number.
NOTE:  The opatch command does not work on Linux platforms and the Siebel version number is updated in the Oracle_Home\Siebel_version.properties file after you install the release. 
 - If necessary, start the Siebel services and application containers. For more information, see Stopping and Starting the Siebel Application Container.
 - Start the Siebel application in the browser to make sure that the application starts successfully.
 - From the application-level menu, select the Help drop-down menu and open up the Technical Support dialog to check the version number.
  
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