The "R25" indicates that this is part of the R25 series of Cinema 4D, which represents a significant update to the software with new features and improvements. However, without direct access to Maxon's latest communications, I can't detail every feature or fix included in the .031 update.
"Well, it paid off. We’re going to use it. But, uh, listen. The file size is weirdly small for a 4K render. Did you compress it?" maxon cinema 4d studio r2531 crack patched