5 Tips on What to Do When Synapse X fails to Download UI Files

by Madhuparna Roy
Madhuparna Roy
Madhuparna Roy
A diploma holder in computers and with a keen interest in technology, Madhuparna is passionate about writing How-to guides and helping people solve the most intricate Windows issues.... read more
Affiliate Disclosure

  • Synapse X is a free tool and an upgraded version of the Synapse Lua script injecting software, specifically used to modify the Roblox games. 
  • The Synapse X UI download error primarily occurs due to security issues caused by your system.
  • In this context, your system prevents downloading files that it suspects can be potentially harmful. 

Synapse X failed to download bootstrapper files

To fix various PC problems, we recommend Restoro PC Repair Tool:
This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues and remove viruses now in 3 easy steps:

  1. Download Restoro PC Repair Tool that comes with Patented Technologies (patent available here).
  2. Click Start Scan to find Windows issues that could be causing PC problems.
  3. Click Repair All to fix issues affecting your computer's security and performance
  • Restoro has been downloaded by 0 readers this month.

Roblox fans tend to modify certain features of a game using Synapse X, but the software sometimes fails to download the UI files as you try to launch/install the Synapse application.

While the error may appear due to the antivirus/firewall applications, it may also show up if the Synapse X software is not launched with administrative privileges.

If you come across the Check your virus protection error on Windows 10/11 notification, you can read our detailed guide to get rid of it.

This post will highlight a few solutions that may fix the Failed to download UI files. Please check your anti-virus software error.

But before that, we will see how to add an exception for Synapse X in the firewall settings.

How do I allow Synapse X through the firewall?

The Antivirus and the Firewall apps can also create conflict when you try to open or use the Synapse X software.

This can trigger the error failed to download launcher files. Please check your network firewall and av.

In such a case, you can turn off the firewall temporarily as shown below:

  1. Press the Win + R shortcut keys to open the Run console.
  2. Type Firewall.cpl in the search bar and hit Enter.type firewall.cpl in run console
  3. It will open the Windows Defender Firewall window in the Control Panel.
  4. Here, click on Turn Windows Defender Firewall on or off on the left.Turn Windows Defender Firewall on or off
  5. Now, select the Turn off Windows Defender Firewall option for both Private and Public network settings.select Turn off Windows Defender Firewall
  6. Press OK to save the changes.

Now, let’s proceed with the troubleshooting process for the failed to download the UI file error, but before that, make sure the Synapse X website is up and running.

How do I fix Synapse X failed to download bootstrapper files?

1. Disable the real-time protection and add an exclusion

  1. Click on the Windows Security icon in the system tray.Click on  Windows Security icon on system tray
  2. As the Windows Security app opens, click on Virus & threat protection on the right.Click on virus & threat protection
  3. Next, go to Virus & threat protection settings and click on Manage settings.Click on Manage settings under Virus & threat protection
  4. On the next screen, go to Real-time protection and turn it off.disable virus & threat protection settings
  5. Now, scroll down, and under Exclusions, click on the Add or remove exclusion link.Add or remove exclusions
  6. On the Exclusions page, click on Add an exclusion and select Folder. Add an exclusion
  7. Now, look for Synapse X and select it to add an exclusion for it.

You can try launching Synapse X and it should be working now.

But, if you are using a third-party security solution, make sure you turn it off temporarily or add Synapse X as a trusted item (add to the exclusion list).

2. Open Synapse X with administrator rights

  1. Right-click on the Synapse X shortcut icon
  2. Select Run as administrator.Run as administrator

Now that the Synapse X software has the right to access the protected system resources, the failed to verify UI data Synapse X error should be fixed.

3. Use a VPN client

  1. Download the VPN of your choice and install the same.
  2. Now launch the VPN software and connect.install and connect VPN

Expert Tip: Some PC issues are hard to tackle, especially when it comes to corrupted repositories or missing Windows files. If you are having troubles fixing an error, your system may be partially broken. We recommend installing Restoro, a tool that will scan your machine and identify what the fault is.
Click here to download and start repairing.

Sometimes, you may encounter the Synapse X download error, if your ISP blocks a crucial related file or process. Hence, using a VPN may help you deal with the error.  

A practical solution to avoid connection errors with the Synapse X tool is to use a flexible VPN like PIA (Private Internet Access)

You have open-source VPN support and thousands of servers in many regions, a no-log policy, or advanced features like the network kill switch.


4. Turn off xFi advanced security

  1. Open the xFi advanced security app and click on More.
  2. On the next screen click on My Services. Click on My services
  3. Now click on Disable to turn off xFi Advanced Security.turn off xfinity advanced security

You can now try launching the Synapse X engine and the xFi Advanced Security by Xfinity will not block the access to the Synapse website anymore.

5. Try another network

The Synapse X app may sometimes fail to work due to a problem with the network connectivity.

In this case, you can try changing to a different network, or use your mobile phone internet through the mobile hotspot.

Synapse X is stuck on downloading DLLs

If the Synapse X is stuck on downloading DLLs for hours, in addition to the above methods, you can also delete the Synapse X /bin/ folder and turn off the auto-launch.

You can then run Synapse X as an administrator, and the error will not show up again.

Alternatively, you can clean boot your system before redownloading and reinstalling the Synapse X software or end any irrelevant processes through the Task Manager.

Besides, try to use the File Explorer instead of a file archiver utility to extract the Synapse archive.

Moreover, if you want to know how to download & use Synapse X for Roblox, we have another detailed guide for your reference.

If you are still struggling to use the Synapse X engine, you can leave your comments here in the comments box below.

idee restoro Still having issues? Fix them with this tool:
  1. Download this PC Repair Tool rated Great on TrustPilot.com (download starts on this page).
  2. Click Start Scan to find Windows issues that could be causing PC problems.
  3. Click Repair All to fix issues with Patented Technologies (Exclusive Discount for our readers).

Restoro has been downloaded by 0 readers this month.

This article covers:Topics: