How to possibly fix Once Human “Checking Patch File Difference” stuck at 0% or 100% error

When updating Once Human, some users will be met with a “Checking Patch File Difference” screen that remains stuck at either 0% or 100%. This is a live-service title that has frequent updates ranging form a series of small hotfixes to content-drops on seasonal changes. Naturally, many users are on the lookout for a remedy to this common update-related error.

In this article, we present the best solution you can try to possibly fix the “Checking Patch File Difference” error once and for all.

Note: The solutions provided herein are not guaranteed to work for every user.

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Potential causes for the “Checking Patch File Difference” error

Once Human (Image via Starry Studios)

Updates for this free-to-play title can download anything from 7 to 8 GB of patch files, which are then extracted before the patching system begins. Therefore, it needs another 7 - 8GB of free space on the drive where the game is installed. Users with low storage tend to be affected by this error the most. The patch/update system should warn users of that, but instead, it breaks down.

Until an official solution is provided by the developers, you can follow the fix below to get the game up and running.

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How to possibly fix Once Human “Checking Patch File Difference” error

Before we begin with this fix, make sure you have at least 10 to 20 GB of free space on the driver where the game is installed. You can uninstall some programs you don't use to achieve more storage.

Here's how to fix the “Checking Patch File Difference” error:

• Go to the directory where Once Human is installed. On Steam, right-click on the game, click on Manage, and select Browse Local Files.
• Once you are in the main game folder, open the Documents.
• Next, select all the files there and delete them.
• After that, close Steam from the System Tray and relaunch it.
• Next, run the game, and it will redownload the patch.

if you have enough free space on the drive this time, the patch will be installed correctly. Now, the game should launch just fine.

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Note that this may not address the issue for all users, but this is the only fix that reportedly works for a majority of Once Human players. If you're facing other error codes for this MMO-lite, the following guides may be of help:

• Once Human stuck at 'Verifying Downloaded Files' error
• Once Human Missing File Privileges error
• Once Human network error
• Once Human crashing on PC error