Hello Rahul
You can run the DB COnfigurator to upgrade the 8.2 Database schemas to 9.8.
Then install the IS,and Process engine and connect to the upgraded database.
This way you retain the 8.2 Process instances data too.
(To be on the safe side you can use a clone of the 8.2 database )
Your old 8.2 designer workspaces will get automatically get upgraded to 98 as soon as you connect to it from a 98 designer.(This is irrevocable so take a backup of your projects )
Hope this helps
Varghese
#webMethods-General#webMethods#Integration-Server-and-ESB#webMethods-Upgrade