As the Database and application is upgraded as you mention, you will have to obtain the information in an indirect way.Check if you can meet the desired objective from:
First method, find the oldest dated file from Oracle base directory:
find /vissys/ -type f -printf '%T+ %p\n' | sort | head -n 10
Second, Query the Oracle Inventory log files, which will give you a set of details.
Hope this helps!