game crashes right after loading

Must be a great game, but no chance to play - crashes 1-2 mins after start...

iMac 27"
2,9 GHz Intel Core i5
8 ГБ 1600 МГц DDR38 ГБ 1600 МГц DDR3
NVIDIA GeForce GTX 660M 512 МБ

Guramka about Total War: Rome II - Emperor Edition, v2.0.4