How to install MinGW in Matlab R2017a?

I have downloaded the Matlab R2017a trial and I am trying to install MinGW. I guess the usual way to do this is in the Add on Explorer, but when I try to use it, it loads indefinitely. I have seen there is a similiar bug in Matlab R2015b (answered here: https://www.mathworks.com/matlabcentral/answers/270385-how-to-install-mingw-w64-compiler-while-i-can-t-load-the-add-on-explorer), but I didn't figure out how to do those steps.

Actually my problem is that I am trying to open a device file, which I can open perfectly in C/C++ using fopen (or similar functions) but I can't do this using Matlab functions, thus I guess using Mex is the best option.