Okay just found the answer in a search
Was not using the root directory to find Application support etc
So it is all good again
Pretty easy to find...go to the link above that says Downloads select Updates insert the product (Camera Raw for Mac or DNG for Mac) in the Find Product Updates drop down and them select the correct download...
For Photoshop CS3 you want ACR 4.6 but for DNG Converter you want the most recent.
Yeah I think I had gone down that path which when you select camera raw Macintosh and you end up with Ver 5.5 for ACR and ditto for DNG converter; but these turn out to be for CS4 if you go down on the download page and see the system requirements.
So I gave them another go, and found they don't work as it is the wrong PS version (CS3 not the CS4 these 5.5's are looking for)
So went and put the version 4.6 ACR for CS3 in and so far so good.
Thanks though, but Adobe have to confuse things by numbering ACR's in a cofused manner