Lightroom 3 no longer recognizing and converting nef files

[MK5C9E]

I have an old version of Lightroom 3 which always worked just fine.  I recently had to upgrade to Windows 10 and now my Lightroom does not recogize, import or convert to DNG those files.  Does anyone have a work around or ideas as to how I can fix this issue.  I tried to download the free Adobe DNG converter, but that link is not working for some reason.

[GoldingD]

Any change in camera?

What camera?

[MK5C9E]

Nope, same camera - a Nikon D800.

[GoldingD]

Sounds like not Lightroom Classic (latest v10)

https://helpx.adobe.com/camera-raw/kb/camera-raw-plug-supported-cameras.html

Perhaps you hace Lightroom (Cloudy) (latest v4)

https://community.adobe.com/t5/lightroom/bd-p/lightroom?page=1&sort=latest_replies&filter=unresolved

[GoldingD]

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.

[Rob_Cullen]

The "old version of Lightroom 3" does not support raw files from the D800. ! SUPPORTED CAMERAS 

You would need at a minimum the 'old' version 4.1 (2012).  10 Years of Lightroom | The Lightroom Queen 

Unless you subscribe to v10 Lr-Classic, the Converter is your only option!

The download link to the DNG Converter is working for me- try again.

DNG LEGACY SUPPORT

https://helpx.adobe.com/photoshop/using/adobe-dng-converter.html

"Old" Lr3 will never "convert" files to DNG- the Converter does that BEFORE you Import the DNGs to the Catalog.