I have same questions for the libmongocrypt usage on the windows. The MongoDB document and support doesn’t help me at all. However, in the source code, I found the usage at: mongo-go-driver/x/mongo/driver/mongocrypt/mongocrypt.go at master · mongodb/mongo-go-driver · GitHub.
From the code description, you need to copy mongocrypt.dll to the path C:\libmongocrypt\bin and copy *.h files to path C:\libmongocrypt\include. You could run your code with golang. If you use other languages, you could include it directly. It is two years after your questions, maybe you didn’t need it. Hope the answer could help others.