The SmartVersion SDK pre-release is a Win32 DLL, with headers for the C.
Windows zipfile of Smartversion on download page contain up to date smartversion dll. Source code on github under MIT licence.
Using the SmartVersion SDK, you can create Win32 applications that read and write
Smartversion SVF file, or read and write patch stream of file..
It contain a C source sample of command line application, equivalent of smv.exe. Understanding the zLib API and Minizip API will help to understand SmartVersion SDK.
The SmartVersion SDK is an additional product, based on SmartVersion technology. It use the smartversion sourcecode, avaiable on github.