Hi Mrinmay,
I wished I saw the warning you sent me via the link below re El Capitan, which created so much headache to my Lightroom 6.2.1 version.! ;-(
I need to finish processing my pictures in less than a fortnight, and with Lightroom crashes is not good timing for me! ;-(
I tried everything you said, but my Lightroom still freezes on me, so I have to find a way to go back to the previous operating system...
With thanks and best wishes,
Thi---
Thi LUCA (Mrs), formerly known as Ms Thi LUONGMobile: +61 (0)410 014 755