How to play Decay Z : Space Survival on Mac

After the earth fall in 2088 - a group of nations establishes a secret project called "iCarus" to send out people to find a new earth (Utopia). this spaceship will spent 200 years for traveling to "Utopia". Unfortunately , some supplys contain "Z-Virus" , people who contact with that supply get infested and mutated , the infested can not control itself and start attack everything.the scientist name "Sayame MiM" the leader of "iCarus" project try to protect the last group of survivors from infested by cut off the electricity of security door but it make power reactor damaged. The last group of survivors have to restore the system back and make everything back to normal. the time had pass until one of engineer in the spaceship wake up from hyper sleep. he will be the one who gonna tell us what is the rest of the story should be.