FAQ
How to Clear Cache Issues (Windows) 
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Close 5UF VPN completely
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Make sure the application is fully exited.
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Check the system tray and Task Manager to ensure no 5UF VPN processes are running.
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Navigate to the cache folder
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Open File Explorer and go to:
C:\Users\user\AppData\Roaming\com.top.wuf
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Important: Replace user with your own Windows username, as that folder represents your account.
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Delete all files inside this folder
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Select all files and folders inside com.top.wuf and delete them.
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This clears any cached data that may be causing issues.
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Restart 5UF VPN with administrator rights
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Right-click the 5UF VPN icon and choose Run as administrator.
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This ensures the app can rebuild its cache properly and avoids permission issues.
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✅ After this process, 5UF VPN should start fresh, without old cached data causing errors or slowdowns.
What to do if the Windows 5UF app cannot start or has cache issues
If the Windows version of 5UF APP does not respond, crashes, gets stuck, or fails to open, the cause is often damaged local cache data.
Recommended steps:
- Fully exit 5UF VPN and make sure no tray icon remains.
- Open
C:\Users\YourWindowsUsername\AppData\Roaming\com.top.wuf. - Delete the cached files in the
com.top.wuffolder. - Restart the computer.
- Right-click 5UF VPN and choose Run as Administrator.
If it still cannot start, contact support and provide your Windows version, device model, screenshot of the error, and the time when it happened.
If you are still using an older client, we recommend switching to the latest 5UF VPN app for better stability and compatibility.
How to Fix the “VCRUNTIME140_1.dll Not Found” Error (for 5UF VPN)
If you're seeing a “VCRUNTIME140_1.dll not found” error when launching 5UF VPN, don’t worry — this is a common issue and can be resolved quickly.
This error occurs when your system is missing a required component from the Microsoft Visual C++ Redistributable package, which is used by many Windows applications.
Follow the guide below to fix it safely and get 5UF VPN running again.
5UF VPN -How to Fix the VCRUNTIME140_1.dll Not Found Error (for 5UF VPN)
How to start VPN automatically after login
If you want VPN to open automatically after you sign in to your computer, use the system's built-in startup settings.
Recommendation: use the latest 5UF VPN app together with the operating system's auto-start feature. This is more stable than older client-based solutions.
Windows:
- Add the 5UF app to your startup items.
- For more reliable startup behavior, run it with administrator permission if needed.
macOS:
- Add the 5UF app to Login Items in System Settings.
- This allows the app to start automatically after you sign in.
If you also want it to connect automatically after launch, make sure the related in-app option is enabled.
