Hi,After installing FortiClient (FortiClientVPNSetup_7.4.3.1790_ARM64), it worked great.After a week, I can no longer start FortiClient.I've already uninstalled it and tried FCRemover.exe.Nothing helped.What's the problem, what can I do?Regards, Martin

Hello again Martin, I found this solution, can you tell me if it helps you, please? To address the "A JavaScript error occurred in the main process" issue with FortiClient on Windows 11, follow these steps: Check Compatibility: Ensure that the version of FortiClient you are using is compatible with Windows 11 ARM64 architecture. Reinstall FortiClient: Uninstall the current FortiClient using the standard Windows uninstallation process. Download the latest compatible version of FortiClient for ARM64 from the official Fortinet website and install the downloaded version. Clear Cache and Temporary Files: Use the Disk Cleanup tool to clear temporary files and system cache. Update System: Ensure that your Windows 11 is up to date with the latest patches and updates. Check for JavaScript Errors: If the error persists, check for any JavaScript-related issues in your system that might be causing the error. If the problem continues after these steps, consider reaching out to Fortinet support for further assistance.

Sylatex

New Member

Solved

Start FortiClient VPN ERROR JavaScript on ARM64 System

Forum|Forum|1 year ago
April 8, 2025
11 replies
4448 views

Hi,
After installing FortiClient (FortiClientVPNSetup_7.4.3.1790_ARM64), it worked great.
After a week, I can no longer start FortiClient.
ERROR Screenshot 2025-04-08 142320.png
I've already uninstalled it and tried FCRemover.exe.
Nothing helped.
What's the problem, what can I do?
Regards, Martin

Best answer by Jean-Philippe_P

Hello again Martin,

I found this solution, can you tell me if it helps you, please?

To address the "A JavaScript error occurred in the main process" issue with FortiClient on Windows 11, follow these steps:

Check Compatibility: Ensure that the version of FortiClient you are using is compatible with Windows 11 ARM64 architecture.
Reinstall FortiClient: Uninstall the current FortiClient using the standard Windows uninstallation process. Download the latest compatible version of FortiClient for ARM64 from the official Fortinet website and install the downloaded version.
Clear Cache and Temporary Files: Use the Disk Cleanup tool to clear temporary files and system cache.
Update System: Ensure that your Windows 11 is up to date with the latest patches and updates.
Check for JavaScript Errors: If the error persists, check for any JavaScript-related issues in your system that might be causing the error. If the problem continues after these steps, consider reaching out to Fortinet support for further assistance.

Anthony_E

Staff

Hello Martin,

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Thanks,

Best Regards

Jean-Philippe_P

Staff & Editor

Hello,

We are still looking for an answer to your question.

We will come back to you ASAP.

Thanks,

Jean-Philippe - Fortinet Community Team

Jean-Philippe_PAnswer

Staff & Editor

Hello again Martin,

I found this solution, can you tell me if it helps you, please?

To address the "A JavaScript error occurred in the main process" issue with FortiClient on Windows 11, follow these steps:

Check Compatibility: Ensure that the version of FortiClient you are using is compatible with Windows 11 ARM64 architecture.
Reinstall FortiClient: Uninstall the current FortiClient using the standard Windows uninstallation process. Download the latest compatible version of FortiClient for ARM64 from the official Fortinet website and install the downloaded version.
Clear Cache and Temporary Files: Use the Disk Cleanup tool to clear temporary files and system cache.
Update System: Ensure that your Windows 11 is up to date with the latest patches and updates.
Check for JavaScript Errors: If the error persists, check for any JavaScript-related issues in your system that might be causing the error. If the problem continues after these steps, consider reaching out to Fortinet support for further assistance.

Jean-Philippe - Fortinet Community Team

SylatexAuthor

New Member

Hello Jean-Philippe,

Thank you, that helped.

best regards Martin

Jean-Philippe_P

Staff & Editor

Hello Sylatex,

I am super glad it helped! Have a good day :)

Thanks,

Jean-Philippe - Fortinet Community Team

SylatexAuthor

New Member

Hello Jean-Philippe,

Today the ERROR is BACK

I tried the repair again!

Unfortunately, without success.

best regards Martin Screenshot 2025-04-24 175056.png

SylatexAuthor

New Member

Hello,

The error is back again today.
Uninstalled, restarted, and reinstalled!
Cleared the cache
=> No change

After updating to FortiClientSetup_7.4.4.1887.F_ARM64, the client won't even start anymore.

What can I do?

Regards, Martin VPN-VIVIN-Screenshot 2025-11-18 141934.png

Andrei_Primend

Explorer

I got it working with FortiClientSetup_7.4.4.1887.F_ARM64 this way:

Uninstalled everything FortiClient related
Uninstalled everything Microsoft Visual C++ redistributable related
Installed FortiClientSetup_7.4.4.1887.F_ARM64 - After that FortiClient would not launch thogh, so another step was needed:
Installed Microsoft Visual C++ redistributable ARM64, restarted PC and then FortiClient finally opened.

But there's a problem, it's the full FortiClient version, which requires EMS support, otherwise it works as a trial for 30 days.

There is no free FortiClient VPN only version for 7.4.4, 7.4.3 is the latest and it didn't work even with those steps above.

oscarmathlin

New Member

Hi,

I also experienced a JavaScript error on a Windows 11 machine with an ARM64 system. After uninstalling both FortiClient VPN and Microsoft Visual C++ and downloading the latest versions, I can’t even run the FortiClient VPN installer anymore (see image). I have also cleared the cache, restarted Windows, etc. Nothing helped. I would appreciate any assistance in resolving this issue.

Skärmbild 2025-11-19 121646.png

RHHSupport

Explorer

Be carefull.
Forticlient version 7.4.3 and Forticlient VPN 7.4.3 have a vulnerability: CVE-2025-46373 with a high Severity!

There is no VPN 7.4.4 Client available. Fortinet is distributing the older vulnerable version trough the fortinet.com website and don't give support for the Free VPN only Client.

SylatexAuthor

New Member

If you log in and then go to Downloads > Forticlient, you can download version 7.4.4!

RHHSupport

Explorer

Yes you can download Forticlient 7.4.4 but not the VPN only. It doesn't exist.

From the release notes:

FortiClient (Windows) 7.4.4 does not include a new version of the free VPN-only agent as no feature
updates were made to the free VPN-only agent between 7.4.3 and 7.4.4. Users can continue to use the
FortiClient (Windows) 7.4.3 free VPN-only agent.

I received information they are working on a VPN only 7.4.4 client but no ETA yet.

TechWorldOmid

New Member

FIXED!!!!!!
There is a solution for installing FortiClient VPN on ARM64 processors.

Check this YT video!

https://youtu.be/eoAWs2_e70A?si=hPBYIMyf-jL61VYD

Andrei_Primend

Explorer

This only addresses the install issue that one person here reported, not the JavaScript error that comes up when launching the client.

TechWorldOmid

New Member

Try to uninstall and re-install the vpn again and your issue will be resolved. I had same case and this method solved the Java script issue.

Andrei_Primend

Explorer

FortiClient VPN-only hotfix 7.4.3.8758 was released on December 11th, installed it on my ARM Surface laptop and it worked without any JavaScript errors.

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