NuGet package is provided for both C++ and .NET projects. Alternatively, you can download plain ZIP file containing all the files. Sources are available via Bitbucket repositories.
NuGet package for C++
C++ NuGet package contains source code that is compiled together with your project. Your project will therefore have no DLL dependencies and there will be no C++ runtime issues. It however means that Debug build of your project will contain slower Debug build of CRC-32C.
PM> Install-Package Crc32C
Then continue to C++ tutorial.
NuGet package for .NET
.NET DLL is AnyCPU, but it automatically forwards all calls to one of the two native DLLs depending on whether the current process is 32-bit or 64-bit. The two native DLLs are embedded as resources and unpacked into temporary location before first use.
PM> Install-Package Crc32C.NET
Then continue to .NET tutorial.
You can download ZIP file containing both the C++ DLLs (and associated LIBs and headers) and the .NET assembly here:
Then continue to C++ tutorial or .NET tutorial.