Lightroom does not work that way. ACR updater will update Photoshop CS6, CC, or CC 2014 and works as a "plug-in". Lightroom has the same guts or "engine" but it is built in, but is not updateable with the ACR updater. Ideally there would have been a LR 5.8 to go with ACR 8.8 on the same day, but there was not. Speculation exists that the next step for Lightroom is LR6. There are also internet rumors that LR6 is behind, heads are rolling at Adobe, midnight oil is in short supply and there should be a release "real soon now".
Use the DNG converter until LR6 comes out. It is not that bad!
Thanks for the reply, but I'm disappointed if that is the case. </understatement>
I read posts such as this (link) where somebody is using RW2 files with LR5 and I followed the link to supported cameras from a Lightroom support page, so my take was it's my install that isn't working correctly yet you are saying that I'm not going to get it working.
My only reason for upgrading was to read these RW2 files.
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The link you posted had all the details to indicate that your camera is not currently supported by any release of Lightroom. It is only currently supported by Camera Raw version 8.8 which is a plug-in that cannot be used by Lightroom (and only by Photoshop). Adobe's free DNG Converter can be used to convert your RW2 files to DNG which is supported by any Lightroom release. Download it here: