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The FactSage 8.4 Update/Installation (2025) package was released in July 2025.

Customers who are entitled to download and run FactSage 8.4 should have been contacted by their FactSage representative.

The FactSage Education 8.4 Package – FactSageEdu is a free FactSage 8.4 Demonstration Version that has also been released. For more information visit FactSageEdu.

FactSage 8.4 Report and Error Messages

Here we post the most recent messages about FactSage 8.4 including items not addressed in What’s New in FactSage 8.4

To date the FactSage 8.4 Apps and Databases are essentially working as designed but there are some issues to report.

Client installation not updating (reported July 28, 2025)

This may occur when the network server is updated to FactSage 8.4. Although FactSage can run on the server it will it not run on a client installation if the client is an old installation (8.3 or earlier) .

One solution is to completely reinstall the client as a new installation. But this takes time.

Alernatively the bug can be fixed by simply relacing in the client installation the file Factsage.exe as follows.

Locate the file Factsage.exe in the server installation: for example
2025-07-07     08:40 AM     3,561,880 FactSage.exe
Copy this file to the client installation and replace the old file factsage.exe.
With the client installation run Factsage and then quit when done.
Finally run the client installation Factsage again.

“Missing or invalid FactSage security key (dongle)” or dongle not working (reported July 27, 2025)

This often occurs for a new installation or even if the dongle was working in the previous installation.
In order to fix the bug:

• • unplug the dongle
  • reinstall the drivers – in FactSage click on Tools – Sentinel Security Key – Express driver installation
  • restart the computer
  • plug in the dongle again and start FactSage.

FactFlow document update

The docmentation on the FactFlow Process Simulation Package has been updated in What’s New in FactSage 8.4.

Specifically a new online manual is now available – FactFlow User Manual – pdf 56 pages.

(revised November 22, 2023)
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The FactSage 8.3 Update/Installation (2023) package was released in October 2023.

Customers who are entitled to download and run FactSage 8.3 should have been contacted by their FactSage representative.

The FactSage Education 8.3 Package – FactSageEdu is a free FactSage 8.3 Demonstration Version that has also been released. For more information visit FactSageEdu News

FactSage 8.3 Report and Error Messages

Here we post the most recent messages about FactSage 8.3 including items not addressed in What’s New in FactSage 8.3

To date the FactSage 8.3 Apps and Databases are essentially working as designed but some issues have been reported.

• Windows 11 error message: “Hasp security key not detected” (reported November 22, 2023)
  This error message may appear with a new installation on a computer running under Windows 11. We have updated the dongle driver installation files in the FactSage 8.3 installation package. In order to fix the bug:
  1. Download again the updated FactSage 8.3 package (CD-FactSage83.exe or FactSage83.zip), run Setup-FactSage83.exe and then select option Update existing FactSage installation
     or
     simply download the small file Sentinel83_2023-11-22.zip (approx size 2 KB) and copy and replace 4 *.bat files in the sub-folder Sentinel (typically c:\FactSage83\Sentinel)
  2. Run FactSage 8.3 and click ‘Tools > Sentinel Security Key (dongle) > Express driver installation‘.

This will first remove any old driver files and then install the new ones. The error message should disappear.

• FactSage 8.3 package downloaded prior to November 2023Some users who downloaded the FactSage 8.3 package during October have reported the following issues;
  • crash (subscript out of range) with “Data Search” option (e.g. Equilib, Phase Diagram,, Predom, etc.).
  • SGTE2017, SGsold and FSupsi databases are missing .

Users who downloaded the FactSage 8.3 package after the end of October are not affected.

In order to fix these bugs download again the FactSage 8.3 package (CD-FactSage83.exe or FactSage83.zip), run Setup-FactSage83.exe and select option Update existing FactSage installation.