|Alpha SLT-A77 II (ILCA-77M2)||ARW||8.5||5.5|
The SLT77 II requires Camera Raw 8.5 or later which is only compatible with Lightroom 5.5 and later.
Lightroom 4.4 will never be able to open Raw files from that camera.
You can either:
What add-on 6.5 did you download? There is no add-on like that for Lightroom. You will either have to upgrade (best choice would be to install Lightroom 5.6) or else use the DNG converter. If you don't understand the DNG converter there are some tutorials available in various places online that will help you.