• 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. 

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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:

Type Firewall.cpl in the search bar and hit Enter.

Here, click on Turn Windows Defender Firewall on or off on the left.

Now, select the Turn off Windows Defender Firewall option for both Private and Public network settings.

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

Click on the Windows Security icon in the system tray.

As the Windows Security app opens, click on Virus & threat protection on the right.

Next, go to Virus & threat protection settings and click on Manage settings.

On the next screen, go to Real-time protection and turn it off.

Now, scroll down, and under Exclusions, click on the Add or remove exclusion link.

On the Exclusions page, click on Add an exclusion and select Folder.

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

Select 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

Now launch the VPN software and connect.

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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.

⇒ Get PIA

4. Turn off xFi advanced security

On the next screen click on My Services.

Now click on Disable to turn off xFi 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.

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