Download the IECM

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Requirements

The IECM runs in the following environments:

• Windows 11 64-bit (We expect that it will run on Windows 7 or later, but we do not actively support this.)
• Using Wine or CrossOver: macOS, Linux and ChromeOS (using the Linux development environment)

MacOS, Linux and ChromeOS users: you will need to install the IECM under Wine or CrossOver. (CrossOver is highly recommended.) Porting Kit is also an option for Mac users. See the Readme file or our user manual for more details. You may also find it helpful to view the video on installing the IECM under CrossOver on our Tutorial Videos page.

The use of the IECM under Wine/CrossOver is not officially supported, however we will try to avoid doing anything that would cause it to stop working.

Are you having trouble running the IECM?

Like many small software developers, the IECM team has not invested the $$$ in a certificate to allow us to sign our applications. That may change in the future, but for now, Windows will say (correctly) that it cannot verify the publisher. However, Windows has recently become much more aggressive about this in some cases. This document describes a couple of confusing situations and what to do about them.

Also, some Windows computers come with a configuration called S mode, which will not allow you to run anything except software downloaded from the Microsoft Store. In this case, you will need to take your computer out of S mode in order to run the IECM.

Download Options

The following downloads are available:

Documentation and License

The documentation and license are included with the IECM downloads. If you prefer to read them in advance, you may download the current License and Readme separately. You may also view the User Manual online.

Citation for IECM 13.0

You may cite IECM 13.0 as follows:

IECM. (2025). Integrated Environmental Control Model (IECM) Version 13.0 (University of Wyoming). https://www.uwyo.edu/iecm/.

Citation for IECM 12.0

You may cite IECM 12.0 as follows:

IECM. (2024). Integrated Environmental Control Model (IECM) Version 12.0 (University of Wyoming). https://www.uwyo.edu/iecm/.

Notification of IECM Updates

You will be given the opportunity to subscribe to updates when you download the IECM, or you may contact us and request to be added to the mailing list.

Change Log for IECM 13.0 (19Nov2025)

This version is being released as beta; assuming no major issues, it will be promoted to the current public release after 6 months, or when the next version is released, whichever comes first.

Changes Since Version 12.0

• • Deep Carbon Capture has been added as an option to the amine system for CO2 capture from 95% to 99%.
  • Some titles and screens have been updated for clarity and consistency.
  • We are dropping support for the 32-bit version and have changed the installer to avoid false positives on virus scans.

Older Versions

Although we encourage you to use the latest version of the IECM, we recognize that some folks need to use an older version, e.g. students who have been told to use a specific version for a class. The following versions are available for download:

If you have saved sessions or fuel databases in a version of the IECM older than 8.0.1, you may download a conversion utility (19MB) to allow you to use these databases in newer versions. This utility only runs under Windows.

You may also view the License and Readme files for these older versions.