December 2025

We are aware that, following a recent Windows update, some users with integrated graphics (laptops) have been experiencing an “unexpected error” message and application shutdown. We are working on a fix, but in the meantime, normal functionality can be achieved by either installing with the “Use software rendering” option ticked, or by:

1. Going to the installation directory e.g.:

   C:\Program Files\LimitState\RING4.2\bin

2. Renaming opengl32sw.dll to opengl32.dll

3. Starting the software

Notes

The LimitState:RING MacOS Beta version is supplied with the following known issues:

• Command line calls must be made from the folder containing the .RING source file(s).

• Flexible (USB dongle) licenses are not supported.

• Academic licensing over WiFi must be undertaken with MAC randomization disabled.

Network Licensing

Academic Licensing

Notes

• Details of our academic licensing system are available here.

• For academic users with Sequoia MacOS and later, please ensure that you have disabled MAC randomization enabled when using your University WiFi network to obtain a license.

Third Party Libraries

Notes

LimitState engineering software incorporates a number of third party software libraries:

• Qt GUI framework: Licensed under LGPL from Qt. Open source code available from www.qt.io/download-open-source

• Mathematical programming solver: © Mosek ApS - Fruebjergvej 3, Box 16 - 2100 Copenhagen O - Denmark

• Software kernel (parts): © University of Sheffield - Sheffield - UK