I downloaded the ACR 4.5 plugin to the proper directory on my Mac, and Photoshop CS3 sees it correctly, and can open RAW (ORF) files from my Olympus E-520.
However, it seems Adobe LightRoom 1.4.1 cannot open RAW (ORF) files from the E-520. Is this normal? Is the problem that LightRoom cannot use this feature of ACR 4.5, or is the problem that there is some out-of-synch cache in LightRoom containing supported cameras? Or does LightRoom contain its own internal version of ACR? I checked, I only have ACR 4.5 installed on my Mac.
Lightroom does not and can not use Camera Raw, period...Camera Raw is a lug-in that will _NOLY_ work in Photoshop and Bridge CS3. If you need a camera that is supported only in CR 4.5 for Lightroom, download the DNG Converter and convert the raws to DNG...then Lightroom 1.x will be able to use them.