In the latest development release of ModelConverterX the way you can specify the different options has changed. Before all options were in one options form, but now they have moved closer to where you need them. That means that the options related to importing or exporting are now found in the same dialog where you specify which file should be imported or exported. And also the dialog will only show the options that are relevant for the format you are working with.

The video tutorial below gives a quick demonstration of where you can find the different options now. I hope you like it!