Here is the Legal from one of their downloads provided by the "wayback" archive.
PERSONAL AND NON-COMMERCIAL USE LIMITATION:
Unless otherwise specified in writing, the software provided herein is for your personal and non-commercial use. You may not modify, copy, distribute, transmit, display, perform, reproduce, publish, license, to create derivative works from in order to transfer and sell any information, software, products or services obtained from the use or review of this software package.
NO UNAUTHORIZED DUPLICATION, MODIFICATION OR REPACKAGING IS PERMITTED WITHOUT WRITTEN CONSENT AND/OR THE WRITTEN CONSENT OF THE AUTHOR(S) WHO’S WORK IS INCLUDED AND DEFINED HEREIN AND HERETO. AS FREEWARE THIS GAUGE/EFFECT OR ANY OF THE INDIVIDUAL CONTENTS OF THE FILE(S) CANNOT BE REPRODUCED, IN PART OR WHOLE, FOR ANOTHER FREEWARE PACKAGE OR USED IN ANY PACKAGE THAT REQUIRES, SUGGESTS OR PERPETUATES A PURCHASE OR SALE OR ANY FORM OF COMPENSATION OR TRADE.
Only the websites and/or companies I have given expressed written consent to distribute this effects package are authorized to distribute it as FREEWARE. An authorized distributor falls under the same distribution guidelines as defined above. The end user is authorized to use this package strictly for personal use in conjunction with MS Flight Simulators. Proper acquisition of expressed written consent is required before reusing this effect, in part, in whole or in any other fashion in order to avoid legal issues from unauthorized reproduction and distribution.
All Microsoft products and the effects code used in the custom designed effects files contained herein are the property of Microsoft Corporation through the terms of the Flight Simulator End User License Agreement and are protected by registered trademarks or trademarks of Microsoft Corporation in the U.S. and/or other countries. No intent to defraud or illegally use the Microsoft trademark, its software, code, name or secure any income or compensation from the production of this effects package is expressed or implied with the creation of this effects package and supporting files. Any other company names, names of authors or their work displayed in this package are for reference only. Unless otherwise specified, no connection to them or their products is expressed or implied. The author of this software or the site it was downloaded from is not responsible for any damage that may result from its installation or use.