•Supported OS – (64-bit versions only) Windows 7 SP1, Windows 8.1, Windows 10.
•Processor. Intel Core i5 2400S @ 2.5 GHz | AMD FX 6120 @ 3.5 GHz.
•RAM. 6GB.
•Video Card. NVIDIA GeForce GTX 660 (2GB) | AMD Radeon HD 7870 (2GB) or better.
Do you have 6gb of ram?
Comparison to the minimum required card. It looks like your card wont suffice based on testing between those two particular cards.
If it does for some reason work, it would be painfully slow or choppy.
http://gpuboss.com/gpus/Radeon-R7-240-vs-GeForce-GTX-660