CIHprep 9.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Education Tools, more precisely Teaching Tools. The program's installer is commonly called cih.exe. This software was originally created by Datachem Software, Inc. The most popular versions of the software are 9.0 and 1.0. We recommend checking the downloaded files with any free antivirus.
From the developer:
Certified Industrial Hygienist Certification Training Software to help candidates prepare for the CIH exam. This software offers over 2500 questions, 17 main topic areas and it aligns with the 2010 CIH exam outline. This is a very useful piece of software that will help you pass your exam.
You may want to check out more software, such as RhymeTime5, RhymeTime7 or Internet TRiLOGI Educational, which might be related to CIHprep.