Also read:Once Human System Requirements: Can Your PC Run It?
Then, what results in this issue on your PC?
Stay calm if you face the tiresome error.
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Many players report that they encounter the Once Human crashing issue when trying to play it.
This post provides reasons and fixes.
According to users, deleting these patch files does a favor.
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Step 1: In Steam, right-click onOnce Human, and chooseProperties.
Step 2: Move toInstalled Filesand click theBrowsebutton.
This will take you to the installation directory of Once Human.

Also, remove them from Recycle Bin.
Step 4: Completely exit Steam, run Steam again with admin rights, and launch Once Human.
This game should re-download patch files.

Thus, make a run at verify the integrity of these files via these steps.
Step 1: Launch Steam and go toLibrary.
Step 2: LocateOnce Human, right-tap on it, and chooseProperties.
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Step 3: Under theInstalled Filestab, hitVerify integrity of game files.
The process will take several minutes and after that, you might launch Once Human normally.
So, move the game to the same client directory and then launch the game without the same issue.
Here is a full guide!
To do this task:
Step 1: PressWin + R, typeNCPA.CPLinRun, and hitOK.
Step 2: Choose your connected connection, right-punch it, and hitProperties.
Step 4: TickUse the following DNS server addressesand setPreferred DNS serverto8.8.8.8andAlternate DNS serverto8.8.4.4.
Next, clickOKto save the change.
Step 5: Typecmdto the search box and run Command Prompt with admin rights.
Step 6: initiate the command ipconfig /flushdns.
Once finished, run Once Human and it shouldnt get stuck.
Many players report that they encounter the Once Human not launching issue when trying to play it.
This post provides some fixes.
Verdict
Is Once Human checking patch file difference but stuck at 0 or 100%?
The solutions described here can help you out.