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1. Remove the installed i21 application in the Control Panel | Programs and Features
2. After uninstall, make sure that webconfig file in the i21 install folder exists.
   
   The i21 Keys should also be retained after uninstall.
3. Run the latest installer.
4. In the install wizard:
   

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            Web Application Name - Enter the same Web app App name used in the previous build/version.

          5. Click Advanced button to select the SQL Server. Else, click Next. Clicking Next button will automatically select IRELY SQL Server                     instance and  default back up folder instance name and default back up      folder D:\irelyinstall\backup. Else,  click Advanced button to select the SQL Server and back up folder path, 

          6. In this screen, enter the Prefix. This corresponds the prefix of the database.  Ignore the Computer field. That is not needed.

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