Hi Judith,
Since you are doing an upgrade of the RA OEBS agent - you would of have a license that contain the allotment to run the RA OEBS agent.
-For the Core, within the V10 IMAGE - it is under the folder "Agents" --> "Rapidautomation" (all RA agents, will use this as its core. Otherwise, you can download just it separately in the download center.
-For the step that mention: Load the Oracle E-Business Suite
.jar (This is referring to the RA solutions)
You will need download the solutions
from the download center and load it into your database using the dbload utility.