Ensure to take back up of the configuration files before proceeding for upgrade. For more information about backing up files, see Upgrade to the latest WIX Version.
For upgrade, follow the below steps:
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Open the latest WIX installer.
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Install the WIX on your server.
If IIS and DB are installed in different server then the WIX needs to be installed in both the servers.
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Select the Upgrade button, and click Continue.
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Select the setups and enter the required information, and then click Update.
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Enter the required information, and click Update.
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Click Finish.