If you're trying to install Ubisoft Connect on your PC or Steam Deck, and you're greeted with this frustrating message:
“Installer integrity check has failed. Common causes include incomplete download, corruption, or virus interference.”
Don’t worry — you’re not alone. This NSIS Error has stumped hundreds of users across Reddit, Steam, and gaming forums. But the good news? It’s fixable.
🔍 What Is the NSIS Error?
NSIS stands for Nullsoft Scriptable Install System, and it’s the tool that packages software installers. If the NSIS installer detects anything unusual — such as an incomplete download, a corrupted file, or a conflicting process — it throws this error to prevent further issues.
🛠️ 10 Ways to Fix the NSIS Error (Proven & Safe)
1. Re-Download the Installer
Start fresh. Make sure your Ubisoft Connect installer was fully downloaded without interruptions. If possible, use a different browser (like Firefox or Edge) and avoid download accelerators.
2. Rename the Installer File
Sometimes, filenames with strange characters can cause errors. Rename the installer to something like ubisoftsetup.exe and try running it again.
3. Clear Browser Cache & Temp Files
If you're repeatedly getting the same error:
-
Clear your browser cache.
-
Use Disk Cleanup or CCleaner to remove temporary files.
4. Use Command Line to Bypass the Error
Right-click the installer and run this command:
<installername.exe> /NCRC
This tells NSIS to ignore the corruption check. Only use this if you trust the file source.
5. Temporarily Disable Antivirus or Firewall
Sometimes your security software interferes with installations. Turn off antivirus/firewall temporarily and retry — just don’t forget to turn it back on afterward.
6. Run as Administrator
Right-click the installer → select “Run as Administrator.” A lack of permissions can also trigger integrity check errors.
7. Flush DNS & Reset Network Stack
Open Command Prompt as Administrator, then type:
ipconfig /flushdns
netsh winsock reset
Restart your computer afterward.
8. Install Using a Different Network
If you're on Wi-Fi, try switching to a wired connection or mobile hotspot. A network hiccup during download can corrupt files.
9. Try Installing on a Different Device
Try installing Ubisoft Connect on another PC or your Steam Deck directly. If it works there, the issue is local to your primary machine.
10. Reinstall Ubisoft Connect Completely
If all else fails:
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Uninstall Ubisoft Connect.
-
Delete leftover files in:
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher -
Reboot, then install again from the official Ubisoft page
💡 Bonus: Steam Deck-Specific Fix
If you're on Steam Deck, install Ubisoft Connect using Heroic Games Launcher or Proton GE, and ensure you’re running it under Desktop Mode.
Make sure your Deck is updated and check Proton compatibility settings under “Properties” in Steam for the game in question.
🎬 Video Walkthrough (Coming Soon!)
We’re publishing a short tutorial video this week showing how to perform steps 1-5 visually — stay tuned and subscribe!
✅ Final Thoughts
Errors like this one are frustrating, especially when all you want to do is jump into Assassin’s Creed or The Division. But they usually have simple solutions.
With patience and the right steps, you’ll be back to gaming in no time.
If this guide helped, drop a comment and share it with a friend still stuck with an NSIS error.
#NSISError #UbisoftConnect #SteamDeckGaming #GamingFix #InstallerError #UbisoftFix #PCGamingTips #GamingSupport #UbisoftHelp #GameInstallError
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