The latest version available is: 3.31 (released on 21.02.2017)
The installer contains both x64 and x86 versions.
There's a version with web-based user interface that is currently available for NAS/Linux/Docker users.
See AirDC++ Web Client home page for more information and installation/download instructions.
All questions and bug reports should be posted on the project page instead of using the forum on this page.