What version of photoshop and operating system are you using?
Photoshop Elements Version 12 running on Windows 8 64 bit version
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Unfortunately, pse 12 can only use up to camera raw 8.5 and your GX8 requires at least camera raw 9.1.1
Are you sure you didn't download the adobe dng converter?
Anyway, unless you upgrade to pse 15, you'll need to use the adobe dng converter to convert the GX8 rw2 files to dng copies which then pse 12 should open.
Thanks for your help.
I downloaded CameraRaw_9_10 - which was said to be the latest version. I missed to compatibility check with PSE.
I'll have a look at which route to go - thanks again.