R21 saw a major UV overhaul: new unwrapping algorithms (including Felt, a fast option), automatic packing, and an edge-based selection mode.
Maxon does not publicly host old versions, but they are available through support channels:
R21 included ProRender 2.0, offering:
While not as fast as Redshift, ProRender 2.0 was a fully integrated, free GPU render engine. maxon cinema 4d studio r21115 x64 multilingual
R21 was a major release with workflow and core architecture improvements:
However, note that R21 does NOT have the full new node-based material system (that matured in R23/R24). It has the Node Space for effects and volumes but not full materials.
There are legitimate reasons to run older software versions: R21 saw a major UV overhaul: new unwrapping
The "Multilingual" aspect is crucial for global teams. R21.115 shipped with:
Switching languages required a simple preference change and a restart – no separate installer.
If you need a modern, free or low-cost 3D package with similar MoGraph capabilities: While not as fast as Redshift, ProRender 2
Cinema 4D Studio is the highest-tier edition of Maxon’s flagship 3D software, offering all features including advanced rendering (physical and ProRender), character animation tools, dynamics, and MoGraph.
The R21.115 designation indicates:
This version was particularly stable compared to earlier R21 builds, making it the preferred choice for production environments until R22 arrived.