Hi Silvio
I did copy the whole PostInstall folder... so I checked the destination packages folder for the BusinessObjects_ClientAction_CrystalReport_Parameters* files and they were in that folder.
I removed them and reran the PostInstall and it has now completed. The contents of the postinstall.log now end as follows ...
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[15/11/2016 15:48:57] [DeployCustomApps.java] File copied from .\cacaf\custom1\webpath.UdmCAFApp\web\WEB-INF\lib\webreporting.jar to D:\Program Files (x86)\CA\SC\CommonReporting4\tomcat\webapps\BOE\WEB-INF\eclipse\plugins\webpath.UdmCAFApp\web\WEB-INF\lib\webreporting.jar
[15/11/2016 15:48:57] [DeployCustomApps.java] File copied from .\cacaf\custom1\webpath.UdmCAFApp\web\WEB-INF\lib\webutil.jar to D:\Program Files (x86)\CA\SC\CommonReporting4\tomcat\webapps\BOE\WEB-INF\eclipse\plugins\webpath.UdmCAFApp\web\WEB-INF\lib\webutil.jar
[15/11/2016 15:48:57] [DeployCustomApps.java] File copied from .\cacaf\custom1\webpath.UdmCAFApp\web\WEB-INF\web.xml to D:\Program Files (x86)\CA\SC\CommonReporting4\tomcat\webapps\BOE\WEB-INF\eclipse\plugins\webpath.UdmCAFApp\web\WEB-INF\web.xml
[15/11/2016 15:48:57] [DeployCustomApps.java] webpath folder custom1 copying is done
[15/11/2016 15:49:03] [DeployCustomApps.java] webpath jar creation is done for custom1
[15/11/2016 15:49:03] [main] DeployCustomApps failed
[15/11/2016 15:49:03] [main] Found the default Tomcat, hence performing it's related operations
[15/11/2016 15:49:03] [main] Copying of CustomParams.properties file is done
[15/11/2016 15:49:03] [main] Copying of CustomParams web path is done
[15/11/2016 15:49:04] [main] Current status of default tomcat is Stop Pending
[15/11/2016 15:49:11] [main] Current status of default tomcat is Stopped
[15/11/2016 15:49:23] [main] Default tomcat got stopped, now deleting workdir
[15/11/2016 15:49:28] [main] tomcat work directory is D:\Program Files (x86)\CA\SC\CommonReporting4\tomcat/work/Catalina
[15/11/2016 15:51:49] [main] CleanTomcatWorkDirectory ran successfully
[15/11/2016 15:51:49] [main] Current status of default tomcat is Start Pending
[15/11/2016 15:52:03] [main] Current status of default tomcat is Running
[15/11/2016 15:52:13] [main] Did not find the WACs server
[15/11/2016 15:52:13] [main] If you are using external web application server, redeployall the web applications to see CAF effect
[15/11/2016 15:52:13] [main] CABI 4.1 Post installation is completed with errors
So it looks like for some reason those BusinessObjects_ClientAction_CrystalReport_Parameters* files were left in the packages directory and the script couldn't overwrite them so bombed out. Not sure how that happened as I don't recall getting any other error than the ones I've listed here. As the files are subsequently removed from the packages directory as part of the PostInstall script it looks like it must have crashed at some point, but I don't know when.
In any case it looks ok now so thanks for all your help.
Regards, John