Downloading IDEA Reinforced Concrete Section 2.1 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the software is IDEA RS, ltd. The following versions: 2.1 and 1.0 are the most frequently downloaded ones by the program users. The software belongs to Education Tools.
From the developer:
RCS program (Reinforced Concrete Section) and its particular modules serve civil engineers to design and check reinforced concrete sections. IDEA RCS is a standalone or “linked to 3D” application. It can be used in continuation to completed structural analysis.
You may want to check out more software, such as Cross Section Analysis & Design, ideCAD Structural or SE::Column, which might be similar to IDEA Reinforced Concrete Section.
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3D Modeling