Established in 1984 Mistral is proud to be widely considered the 'generic' software system provider for the refrigeration & air conditioning industry. In its domestic market, Mistral software is used by more than 85% of refrigeration & air conditioning contracting firms and programs have been distributed to over 17,000 users in over 100 countries around the world.

Bugs happen. And one just did!

Bugs happen! Occasionally and anyone pretending they don't create any are only deluding themselves.

Bug 2
Less of a bug, more a case of a simple improvement to Dynamic Error Trapping of Product Respiration Load coding.

Bug 1
A rarely occuring program crash fix.

If you do not have a tame IT Administrator or Manager handy then you may need to fix the problem yourself.

If your Mistral 'Corporate program installation stalls and refuses to restart, instead displaying a 'Critical Exception' Error or similar message then don't panic. The error has been identified and fixed. As of 25 February 2020 and within twenty minutes of its discovery.

At bottom left of your monitor there is a dialog box and which normally displays 'Type here to search'.

In the dialog box type 'regedit' (but without the inverted commas) and hit your Enter key.

A small form will appear which is the Windows 'User Account Control' inviting you to either proceed 'Yes' or decline 'No'. Click 'Yes'.

You are now in a small ancillary Windows system file which amongst other things saves simple commands for starting the Apps (programs) on your computer.

Find and click on HKEY_CURRENT_USER.

Then click on software.

Then click on Mistral Associates

Then look for Launcher; highlight the name Launcher and hit your Delete key.

This will clear a false entry in the Launcher instructions caused by a bug and which was due to a simple, single digit coding error.

Having deleted the Launcher entry then the next time you run a Mistral program, using the bug fixed version, then the essential Launcher entry will be created again automatically. So there will be nothing further that you have to do except re-install, using ONLY the bug fixed program version of course. The simple instructions for doing so are below.

Finally, return to and complete the short download request form (for Existing Licensees) hit Submit, download the #Setup.exe file and run it. As a currently licenced user of Mistral programs you should not normally need to enter a new Access Registration Code. If you do then we will recognise this automatically and send you a new Access Registration Code to the email address you entered when you completed the request form.

Our apologies for the inconvenience. In mitigation, with over a hundred million bytes of manually generated computer code occasionally it is possible for a tired operator to make a simple mistake. Entering a O where it should have been a 0 for example.

The important thing is that we found the error - quickly. Held our hand up and admitted it and then fixed it within minutes. Publishing these simple instructions on how to resolve the problem at your end.

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Bug 2.

Food Product Respiration Loads


A situation could occur where a Fruit or Vegetable or General Purpose store is significantly resized upwards and where the product respiration load is not adequately recalculated to reflect the increased product capacity in the larger room volume. Whilst this would be unlikely to render the final load calculation load result nonviable the final load would nonetheless not be strictly correct.

Mistral’s policy has always been that its programs are an aid to good engineering practice but not a substitute for ‘due diligence’ in engineering. Mistral accepts however that due diligence is rarely if ever totally applied. Particularly where following years of relying upon a computer program that has always proven its worth as totally reliable.

Mistral’s engineers and programmers have therefore introduced a more rigorous set of both automatic ‘dynamic error trapping’ coding, along with additional on-screen prompts and warnings associated with product respiration input parameters. Thereby totally eliminating any risk of user error in the area of product respiration heat gain routines.

Mistral 'Corporate' and 'Subscription' account Licensees may update with a single installation here:-

Download for existing Licensees For replacement or updating programs & databases in current installation.

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Mistral's commitment:

Bringing the benefits of computerisation to our industry - without the historically associated problems.