You should select Qt 5.11.1; if you expand that and see that it includes Qt Creator, Qt Designer, and MinGW, then that's all you need. If it doesn't, then select Qt Creator, (which should also install Qt Designer), debugger support, and the version of MinGW you want (probably the latest) from the Tools options.

When you expand Qt 5.11.1, you may see a bunch of compilers listed. Selecting one of these does not install the compiler; it only installs the Qt libraries that are compatible with that compiler. Select the one that corresponds to the version of MinGW you will use. You should also install the Qt source code. It will help in debugging.