In terms of game file size, you will need at least 100 MB of free disk space available. Defense Contract system requirements state that you will need at least 4 GB of RAM. An Intel Core i5-4590 CPU is required at a minimum to run Defense Contract. The cheapest graphics card you can play it on is an NVIDIA GeForce GTX 970.
Defense Contract will run on PC system with Windows 7 and upwards.
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