Did you install Just Cause 3 on a 32-bit version of Windows?
If you answered "yes," that's your problem.
If you answered "no," continue below.
Some users reported their Windows PC copy of Just Cause 3 refuses to load due to corrupt files. Here's a couple tips that should get your game running:
Tip 1: Check Your Hard Drive Space
A corrupt download can be caused by a lack of hard drive space. If you filled up your hard drive before Just Cause 3 finished downloading, the remaining files will fail to download. If that's the case, you'll need to free up some hard drive space and redownload that title.
Tip 2: Verify Your Just Cause 3 Files
If a lack of hard drive space isn't your issue, you can check for corrupt Just Cause 3 files by following these steps:
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Right click on Just Cause 3 and click on Properties.
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Click on Local Files and click on Verify Integrity of Game Cache.