Can Lightroom 6 (non CC) handle raw files from Nikon D500 and Fuji xpro2?
Both these Cameras are supported in Lightroom 6.Refer Cameras supported by Camera Raw
Make sure you update to the latest version.
In addition to what Akash said you can bookmark the following link to Adobe Lightroom Journal where you will be able to browse the full history of the development of Lightroom /Adobe camera Raw.
Lightroom Journal | Tips and advice straight from the Lightroom team.
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