Before you perform an unattended upgrade to CA Process Automation Release 4.2, locate the response.varfile from your current installation of CA Process Automation.
This file can be found here:
<install_dir>\server\c2o\.install4j\response.varfile
You need the values for the required parameters to complete the upgrade to CA Process Automation Release 4.2. Once you have obtained those values, start the unattended upgrade with the same command as in a new installation.
Note: jTDS drivers are mandatory in CA Process Automation Release 4.2. jtds-1.3.1.jar is included in the drivers folder of DVD1. Any response.varfile parameter from a previous installation that includes a reference to an SQL JAR file must now be replaced with a jTDS value in the CA Process Automation Release 4.2 response.varfile.
For example, a CA Process Automation Release 3.1 response.varfile could include the following parameter:
runtimeDriver=C:/Users/Administrator/Desktop/2013_11_11/DVD1/drivers/sqljdbc.jar
In CA Process Automation Release 4.2, that parameter becomes:
runtimeDriver=C:/Users/Administrator/Desktop/2013_11_11/DVD1/drivers/jtds-1.3.1.jar
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