Here is the link to download the latest ColorWorkbench, colorWorkbench_25.2.zip (Include both software and user manual). 

You can install the software directly. If no license is present, it will automatically start a 30-day trial.

To purchase a full license, please contact support@hunterlab.com.

You can also check the revision history for ColorWorkbench. The User Manual can be downloaded from this link: User Manual colorWorkbench 25.2.pdf.