when i build Droneshell fatal error C1083: 无法打开包括文件: “Eigen/Dense”: No such file or directory
Eigen/Dense Why can't I find this folder?
and this fatal error C1083: 无法打开包括文件: “rpc/rpc_error.h”: No such file or directory
I think I had a similar error in the past. I manually downloaded and copied eigen but that has solved this problem and created new problems. What solved all my problems was making sure that visual studio had VC++ 2015 installed. Check out the screen shot

Thank you for your reply, I have solved this problem myself, I checked the code in build.cmd, according to the error prompt, I found that I can not get the zip package to download the connection. So I manually downloaded and created the folder according to the logic of the code, put the required files into it, the problem is solved, but I still don't know why the code of build.cmd can't download the zip package, if anyone sees it and Know, I hope to reply so that others can see it.
For anyone still having this problem, the .bat files needs to be run on "x64 Native Tools Command Prompt for VS 2017/2015", use windows search to bring it up then run the build.bat
If it says cmake isn't found, download it manually from their website.
Thank you @hesham-akmal, That is in the instructions of the current documentation