Starting 6 July 2026, a minimum version requirement will be enforced by the backend for Tosi Client on desktop platforms (Windows and Mac). This change ensures improved security, stability, and compatibility across all services. Note, this does not impact to Tosi Client on iOS and Android.

What’s Changing

• Tosi Client version 4.4.1 will be the minimum version required.
• Versions of Tosi Client older than 4.4.1, including those named Tosibox Key, are no longer supported.
• The backend will actively enforce this requirement.
• Users running an unsupported version will encounter an error message: “Too old client.”
• Access and functionality will be blocked until the client is updated to a supported version.

Currently supported Tosi Client versions:

Required Action

• If you are already running Tosi Client version 4.4.1 or newer: No action is required.
• If you are running an older version: You must upgrade your client to continue using the service after July 1, 2026.

Updating Your Client

• Tosi Client includes an automatic update feature.
• If your client prompts you to update, simply accept the update notification to install the latest version.
• Alternatively, find manual install instructions here: Helpdesk - Tosi desktop Client for Tosi Key software - Tosibox Service Portal In some cases it might be necessary to remove the old software and reboot the PC before installing the newest version. 

 

To avoid service interruptions, we strongly recommend updating your client ahead of the enforcement date. Staying up to date ensures you benefit from the latest features, performance improvements, and security fixes.

If you have any problems updating your client, please reach out to our technical support at help@tosi.net. 

Notes

• Keys 100 will no longer work with version 4.4.1 or newer (Reminder of the deprecation of support for TBK1)
• If after the update a popup window appears that asks you to register your Key, please check the following article for further information and instructions: Master Key Registration
• Supported operating systems for version 4.4.1:
  • Windows 11 and 10 (64-bit Intel x86 architecture)
  • Windows Server 2019
  • macOS 15 Sequoia on ARM and Intel
  • macOS 26 Tahoe on ARM and Intel
    See also Tosi Client (for Windows and Mac) software releases
• Windows 10 is not supported anymore from version 26.6.0 onwards. If you are using Windows 10, please install version 4.4.1 using the following link: https://downloads.tosibox.com/downloads/tbsetup_v4.4.1.exe