That camera model requires at least Lightroom 5.4. Lightroom 4 cannot be updated in any way to support that camera. It would be next to impossible for you to find Lightroom 5 available for purchase anywhere. Adobe hasn't sold it for quite some time. It is old, obsolete, and simply isn't available anymore. If you don't want to update from Lightroom 4 then your best choice would be to download the DNG converter and convert your raw files to the DNG format. Those DNG files could then be opened in Lightroom 4. Your other choices would be to purchase Lightroom 6, which has been updated for about the last time but would support your camera. Or, you could subscribe to the Adobe Creative Cloud photography plan which costs $9.99/month and includes the latest versions of Lightroom and Photoshop. It is decision time. The software that you have now will not process the raw files from your camera, and cannot be updated in any way to do so.