Fix: Failed to Download Bootstrapper Files Synapse X

You may fail to download Bootstrapper files in Synapse X due to blockage by the antivirus/firewall applications or your ISP. Moreover, you may also get the error under discussion if Synapse X is not launched with administrative privileges.

The affected user encounters the error when he tries to launch/install the Synapse application. Some users encountered the error just after the download, whereas other users encountered it after using it for a long time.

Failed to Download Bootstrapper Files Synapse X

Before proceeding with the troubleshooting process, make sure the Synapse website is up and running. Moreover, perform a simple restart of your system to check if the problem is solved (a solution reported by many users to work).

Solution 1: Launch Synapse X with Administrator Privileges

In the latest version of Windows, Microsoft has beefed up the security and privacy features of its OS. One of such features is to use UAC to restrict access to vital system resources. You may encounter the error under discussion if Synapse X does not have the right to access protected system resources. In this context, launching Synapse X with administrative privileges may solve the problem.

  1. Right-click on the shortcut icon of Synapse X and then click on Run as Administrator.
    Run the Launcher as Administrator
  2. Now check if Synapse X is operating fine.

Solution 2: Use a VPN Client or Try Another Network

ISPs impose different types of techniques and methods to control traffic and safeguard their users. You may encounter the error at hand if an essential file/service/resource is blocked by your ISP. In this context, using a VPN may solve the problem. You can opt to use another network or hotspot of your mobile.

  1. Download and install a VPN client of your choice.
  2. Now launch and connect to your preferred location. You can opt to use another network or hotspot of your mobile (but keep an eye on the size of the download).
  3. Then check if your Synapse X is clear of the error.

Solution 3: Turn Off Advanced Security (Xfinity Only)

xFi Advanced Security by Xfinity adds an extra layer of protection (in the real-time) for your devices by blocking malicious sites and cyber-threats. You may encounter the error under discussion if xFi Advanced Security is blocking access to the Synapse website. In this scenario, disabling the xFi Advanced Security may solve the problem.

  1. Launch the xFi app/site and navigate to More.
  2. Now select My Services and then Disable xFi Advanced Security.
    Disable xFi Advanced Security
  3. Then launch Synapse X to check if it is operating fine now.

Solution 4: Allow Synapse X Through Your Antivirus (Windows Defender) and Firewall Applications

Antivirus and Firewall applications play a vital role in the security of your system and data. You may encounter the error at hand if your antivirus/firewall application is blocking essential file/service/process for Synapse X. In this context, temporarily disabling your antivirus application and turning off your firewall may solve the problem. You can also opt to add exceptions for files/services/processes related to Synapse X in Antivirus/Firewall settings.

Warning: Proceed at your own risk as disabling (or adding exceptions to) your antivirus/firewall applications may expose your system to threats like viruses, trojans, etc.

  1. Temporarily disable your antivirus.
  2. Turn off your firewall temporarily.
  3. Keep an eye on Windows defender, if it takes up the role of antivirus/firewall, then disable it as well (at least disable real-time protection of Windows Defender).
    Disable Real-Time Protection in Windows Defender

If you want to add an exception for Synapse X in antivirus/firewall settings, then add an exception for the whole folder of Synapse X. For illustration, we will discuss the process for Windows Defender.

  1. On the Taskbar of your system, click on Windows Search box and type Virus & Threat Protection. Then in the list of results, click on Virus & Threat Protection.

    Open Virus & Threat Protection Settings
  2. Now, scroll down till the end and then click on Manage Settings (under Virus & Threat Protection Settings).
    Click on Manage Settings Under Virus & Protection Settings of Windows Defender
  3. Then, scroll down till the end and then click on Add or Remove Exclusions (under Exclusions).
    Open Add or Remove Exclusions in Windows Defender Settings
  4. Now click on Add an Exclusion and then in the menu shown, click on Folder.
    Add an Exclusion for a Folder in Windows Defender
  5. Now navigate to the Synapse X folder and click on Select Folder.
  6. Then launch Synapse X to check if it is clear of the error.

If you are still having issues, redownload and reinstall (with administrative privileges) the Synapse X while keeping your antivirus/firewall disabled (do not forget to add an exception for the complete folder of Synapse X in the antivirus/firewall applications especially Windows Defender).

It will be a good idea to clean boot your system before redownloading and reinstalling the application or close all unnecessary processes through the Task Manager. If possible, try to use antivirus like The Web Root which is compatible with Synapse X. Also, when extracting Synapse archive, try to use File Explorer (not WinRAR or  7-Zip, etc.).

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Kevin Arrows


Kevin is a dynamic and self-motivated information technology professional, with a Thorough knowledge of all facets pertaining to network infrastructure design, implementation and administration. Superior record of delivering simultaneous large-scale mission critical projects on time and under budget.

Expert Tip

Fix: Failed to Download Bootstrapper Files Synapse X

If the issue is with your Computer or a Laptop you should try using Restoro which can scan the repositories and replace corrupt and missing files. This works in most cases, where the issue is originated due to a system corruption. You can download Restoro by clicking the Download button below.

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