Hi @RupaJ
Will you be performing upgrade in place, full migration using SMU or partial using promotion?
My answers to your questions:
1) What third party software are you referring to, Can you share some examples? If you mean SAS provided data servers, web servers etc, then they will be upgraded using SAS Wizard. You don't have to worry about them. If there are any specific software required for a particular SAS solution, then I would suggest you read the pre-requirements document for the solution.
2) I don't think you will have to revert any configuration files, unless there is some custom configuration developed and deployed at your site. Take note that any changes to the configuration files like SASV9.cfg, setenv.sh, server.xml will be overwritten during the upgrade. It's better to take a backup of these changes.
3) Yes it's recommended to run the content assessment tool. If you are looking for partial promotion SAS9 Inventory can help you list all the different type of objects in your deployment.
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