There is nothing more irritating than running into the Quarantine Zone: The Last Check Demo crashing/launch failure issue after a long wait during gameplay or at startup. Want to know how to solve it? This MiniTool guide provides several effective approaches to help you return to seamless gaming experiences.

Quarantine Zone: The Last Check Demo came out on May 22, 2025, which is a puzzle game centered on inspecting survivors from a zombie apocalypse for signs of infection. It’s a serious inspection game where there’s no room for error. Everyone might be infected, and every decision you make impacts what happens next.

As a demo, players might encounter some technical problems, such as Quarantine Zone: The Last Check Demo crashing or failing to launch, unexpected frame drops, character models disappearing, and survivors wandering around incomplete structures.

If you’re dealing with the Quarantine Zone: The Last Check Demo not launching or crashing issue, there are several straightforward steps you can take to fix it:

• Restart your PC.
• Update Windows.
• Close conflicting or unnecessary programs in Task Manager.
• Disable the Steam overlay.
• Update your GPU driver.

Now, let’s dive into more detailed and complex methods to solve the problem where Quarantine Zone: The Last Check Demo crashes at startup on PC.

Method 1. Verify the Game Files

If you obtained Quarantine Zone: The Last Check Demo via Steam, you can check your library to confirm that the files aren’t corrupted. Follow these steps to finish the process:

1. Open Steam, go to your Steam Library, right-click Quarantine Zone: The Last Check Demo, and select Properties.
2. In the left panel, select the Local Files tab and click the Verify integrity of demo files button in the right section. During this process, the game files will be checked for any corruption.

Note: If you accidentally lose or delete game files or other data stored on your local drives, we suggest using MiniTool Power Data Recovery for saved game file recovery. This tool enables you to recover up to 1 GB of files for free.

Method 2. Run the Game in Compatibility Mode & As an Administrator

To tackle any permission-related or compatibility issues with Quarantine Zone: The Last Check Demo, including crashing or failing to launch, you can start the game with elevated privileges and run it in compatibility mode.

1. In your Steam Library, right-click Quarantine Zone: The Last Check Demo and select Manage > Browse local files.
2. Right-click on the “QZSim” exe file and choose Properties.
3. In the window that opens, go to the Compatibility tab. Check the box for Run this program in compatibility mode for and select Windows 8 or Windows 7 from the drop-down menu. Next, tick the boxes for Run this program as an administrator and Disable fullscreen optimizations.
4. Click Apply > OK to confirm the changes.
5. Right-click the Steam icon on the desktop and choose Run as administrator.

Method 3. Adjust the Game Launch Options

Some players have mentioned that tweaking the launch options helped resolve the Quarantine Zone: The Last Check Demo not launching/crashing problem. You can try this by following these instructions:

1. Open Steam and go to your Library.
2. Right-click Quarantine Zone: The Last Check Demo and select Properties.
3. Go to the General tab and enter this text into the Launch Options box: -dx11.
4. Start the game and see if the issue is resolved.
5. If these launch options don’t fix the problem, you can test the following options one by one until you find a solution: -dx12/-d3d11/-d3d12. If none of these commands work, clear the command in the box and explore alternative solutions.

Method 4. Play the Game on a Dedicated Graphics Card

Before attempting this solution, ensure your GPU driver is updated first. After updating, follow these steps to play Quarantine Zone: The Last Check Demo on a dedicated graphics card:

1. Press Win I to open Windows Settings, then select System > Display > Graphics from the options on the right.
2. Under the Custom options for apps section, click on Add an app, browse to the game installation folder: C:\Program Files (x86) > Steam > steamapps > common > Quarantine Zone The Last Check Demo folder, select “QZSim” exe file, and then click Add.
3. Click on Options to open the GPU preference window and choose High performance from the drop-down menu. Afterwards, click the Save button.
4. Again, click Add desktop app. Browse to C:\Program Files (x86) > Steam > steamapps > common > Quarantine Zone The Last Check Demo > QZSim > Binaries > Win64 folder. Select QZSim-Win64-Shipping exe file and click on Add.
5. After adding, expand it, click Options, select High performance, and click Save.

Method 5. Permit the Game Through Firewall/Antivirus

Occasionally, the Windows firewall or antivirus might block the game from running, causing the Quarantine Zone: The Last Check Demo crashing or failing to launch issue on PC.

1. Type Windows Security in the Windows Search box and press Enter.
2. Click Virus & Threat Protection. In the new interface, scroll down and click Manage ransomware protection.

3. Ensure Controlled folder access is toggled On and click Allow an app through Controlled folder access. In the pop-up window, click the Yes button.

4. Click Add an allowed app. Then select Browse all apps and browse to C:\Program Files (x86) > Steam > steamapps > common > Quarantine Zone The Last Check Demo folder, select the “QZSim” exe file, and then click Open to add it to the list.

5. Click Add an allowed app again and click Browse all apps. Navigate to C:\Program Files (x86) > Steam > steamapps > common > Quarantine Zone The Last Check Demo > QZSim > Binaries > Win64 folder, select QZSim-Win64-Shipping exe file, and click Open.

6. Press Win S to open the Windows Search bar, type Windows Security, and press Enter.

7. Select Firewall & Network Protection, and then click Allow an app through firewall.

8. Click the Change settings button. Then, click the Allow another app button.

9. Click Browse next to the Path option and add the “QZSim” exe file. After adding, make sure the Private and Public boxes are ticked.

10. Again, add the QZSim-Win64-Shipping exe file and tick the Private and Public boxes.

11. Click the OK button to save the change.

Final Thoughts

This guide provides five practical ways to fix the Quarantine Zone: The Last Check Demo crashing or failing to launch issue on PC. Hopefully, you can enjoy your game again.

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