Nowadays PDB files that are required for debugging are provided in a separate package. These package contains smaller 7zip files that has to be extracted into the correct sub folder of the Qt installation. In case of Qt 5.10.1 there are 134 packages, one for every module and compiler.

This means to get a fully functional debug setup for Qt you have to manually pick all the required packages for your project and extract them into the correct sub folder of your Qt installation.

This set up is to much work for a basic development task like debugging which should work out of the box when using a SDK.

Providing one 7 zip file for every compiler and not per module or an installer for the PDB files would lower the pain. In my personal opinion the previous approach with the PDB files inside the package was much better.