Here are some steps you can try.
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Verify Unreal Engine 4.
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Upgrade your graphic card.
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Make a scan for bad ram on your computer
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Make sure your antivirus and firewall don’t interfere with Unreal Engine
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Try to disconnect your internet connection and see if that works.
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Make a scan for bad ram on your computer.
Tell me if any of this did help you or if you need more help.