Resolve 10.1.1 to 10.1.5 issue (keeps crashing)

Good morning everyone

I've been using Resolve Lite 10.1.1 for some time now and its been working fine so far. But when i recently upgrade to 10.1.5, it stopped working (crashes even before it opens up).
Had to go back to 10.1.1 which works.

Can someone tell me what the issue is please.

My gear-
iMac
27-inch, Mid 2011
Processor 3.4 GHz Intel Core i7
Memory 16 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6970M 2048 MB
Software Mac OS X Lion 10.7.5 (11G63)

Ok got my answer as to why its not working

need OSX 10.8.x and above