To all having crash issues with Melodyne, check which Microsoft Visual C++ 2015 Redistributable you have installed.
If you have a version newer than Microsoft Visual C++ 2015 Redistributable -14.0.23026, uninstall both x86 and x64 versions, dl the official release from Microsoft and most of the crashes, if not all, will be alleviated.
I've helped others fix their crashes with this suggestion.