What version of Photoshop do you have, and on what type of computer (PC/Mac)?
Are you having a problem with updating your Photoshop, where you’re getting an error message, or are just unsure what to do to update things?
Keep in mind that this is a user-to-user forum. If you want to communicate to an Adobe support person, directly, you’d probably want to find a Chat button on the pages that lead you to this forum.
A G5 needs at least ACR 7.2 (CS6). Could not find FZ120, but if this is FZ150 it needs ACR 6.5 (CS5).