Joe and the Green Coil (SPOLIERS)
These are two ways I see the main characters preventing the mostly fatal conclusion:
1) Include Joe! From the very beginning he is the only one they needed to worry about as he is security, a friend/co-worker, and around every day.
They thought they had thought of everything that would alert officials, such as hiding the bodies and moving the car, but what about Joe? Its his job to watch out for suspicious activity. If they had simply explained it to him, then all four of them could have gotten rich.
The final picture does not matter as we cannot see their bodies in the pic itself so their deaths were avoidable. The blood could have been anyone's, or fake, or not blood at all. Even if the bookie was involved they had a much better chance of dealing with him with Joe's skills/connections.
So ideally they collect large sums of money as inconspicuously as possible. Then they purchase a large private house & property, they move the machine, and become the most powerful people in the world. Or course they could also purchase the apartment complex itself.
If anything they were not thinking big enough, which is a bit ironic when most movies like this are about someone going too large. So perhaps that was clever in a way, no, it didn't fit, they all wanted a better life, now they had the means. Really it comes down to how much you want it and how heavy/delicate the machine is.
OR
2) It is possible that the photograph of the green coil painting is what connects the timeline, if that painting is never made then the timeline we saw never would have happened.