There was a download of CPT-pro 5.61 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. The following versions: 5.6 and 5.5 are the most frequently downloaded ones by the program users. The CPT-pro installer is commonly called CPTExplorer.exe. The actual developer of the program is Geosoft Sp. z o.o. The software is included in Education Tools.
From the developer:
CPT-pro is a multi-module program designed for complex analysis, interpretation and presentation of CPT soundings, and also for elaborating geotechnical documentation. Methods of CPT sounding interpretation along with formulae and graphs have mostly been extracted, with the knowledge and consent of the authors
You may want to check out more software, such as Panel, Lasergene or gitoolbox, which might be similar to CPT-pro.