Aerosoft released version 1.2.5.0 (and subsequent hotfixes) specifically targeting FSX: Steam Edition and the original FSX Gold/Acceleration packs. The patch notes focus heavily on quality of life fixes:
The original CRJ sounded like a vacuum cleaner. The 1.2.5 update integrates a modified sound set from the Turbine Sound Studios (TSS) library, specifically capturing the genuine GE CF34-8C1 whine on spool-up. You will actually hear the "whistle" during reverse thrust now. aerosoft crj fsx updated
If you are reinstalling your old FSX setup or buying the boxed version from a bargain bin, you need this update. Here is the changelog of the final supported state of the aircraft. Aerosoft released version 1
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If you are re-installing the CRJ from a disk or an old download: Cons: If you are re-installing the CRJ from