If the headers and library are out of sync, a warning log will be displayed when calling Stormancer::IClient::create(). Look for this log in your application’s output.
In this case, the easiest solution is to delete the stormancer library and header files, and copy them again from a known working release package.
Note that header/library version mismatch can optionally be detected at link time, causing a linker error in case there is a mismatch.
To enable this behavior, add the macro STORM_CHECK_VERSION_LINKTIME to your project’s preprocessor definitions.