How To Fix Unarcdll Returned An Error Code14 Upd

How to Fix "Unarc.dll Returned an Error Code -14" in Upd (Setup/Installation)

If you’ve landed on this page, chances are you’ve been staring at a frustrating error message mid-installation. You’re trying to install a game, a large software bundle, or a repack (often from sources like FitGirl, Dodi, or ElAmigos), and suddenly the process halts with the dreaded:

"Unarc.dll returned an error code: -14"
Often accompanied by: "ISDone.dll" or "An error occurred while unpacking: Unable to write data to disk!"

The "upd" in your search query likely refers to Update or an Updater component of a repack installer. This error is notoriously common when installing large, compressed setups (usually games) on Windows 10 or 11. how to fix unarcdll returned an error code14 upd

The good news? Error -14 is almost never a sign of a corrupted download. It’s almost always a system resource, permission, or compatibility issue. This guide will walk you through every proven solution, from simple to advanced.

The Golden Rule: Before You Do Anything

Do not immediately redownload the entire game. Redownloading a 60GB file should be your last resort, not your first. Try the following solutions in order. Solution #1 solves this error for 70% of users. How to Fix "Unarc

1. Run the Installer as an Administrator (The Quick Check)

Sometimes Windows blocks the .dll from accessing system resources.

Summary Cheat Sheet

| Symptom | Likely Fix | | :--- | :--- | | Error appears at 30-50% | Antivirus interference (Fix #2) | | Error appears at 90% | Low RAM / Virtual Memory (Fix #3 & #5) | | Error appears instantly | Corrupted download (Run Verify tool - Fix #6) | | PC freezes then shows error | Bad hard drive sectors (Run CHKDSK - Fix #4) | The Golden Rule: Before You Do Anything Do

Step 3: Increase Virtual Memory (Page File)

Error -14 often occurs when the installer runs out of memory during decompression. Even if you have 16GB of RAM, the default page file may be insufficient.

Here’s how to increase it:

  1. Press Win + R, type sysdm.cpl, and press Enter.
  2. Go to the Advanced tab → Under Performance, click Settings.
  3. Go to Advanced → Virtual memory → Change.
  4. Uncheck "Automatically manage paging file size for all drives".
  5. Select your drive (preferably the same drive you’re installing to).
  6. Choose Custom size:
    • Initial size (MB): 8192 (8GB)
    • Maximum size (MB): 16384 (16GB)
  7. Click Set → OK → Restart your PC.

After restarting, try the installer again.