There was a download of Therakles 3.1.8 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions among the software users are 3.1 and 2.2.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of the free software is Dresden University of Technology. The default filenames for the program's installer are RoomModel.exe or Therakles.exe etc. The program lies within Office Tools, more precisely Calculators.
From the developer:
The simulation program Therakles calculates the dynamic thermal or hygrothermal behavior of rooms and buildings. It is a calculation tool for planning engineers and architects in the field of building physics, or building climatology, and technical building equipment.
You may want to check out more software, such as McDalton Professional Edition, LoanExpert Plus or A-Converter, which might be related to Therakles.