On my System (Windows 8.1; LR 5.2) the new version (2.0) doesn't open a window and doesn't export a file anymore. Before this new version it was ok.
If you right click on picture on click on cr2hdr, no windows open. To see the windows, you need to go to Export... and select cr2hdr

but it doesn't explain why you don't have the result file... maybe it's the same problem from tomuse.
converting directly to a subfolder for instance named "ML". Maybe I,m missing something.
With v2, you can't import into a subfolder. I can add a field to add a custom name to create a new subfolder on the top folder

Yes this is correct, after the conversation the DNG file is under the TEMP Folder in Lightroom, but the dng File will not be move in the original Folder. Under the Version 1.03 the workflow is running
So, the conversion work, but the move doesn't works (strange!) Do you have a file with the exactly same name of the output file ?
All your problem appears on Windows or Mac ?
Unfortunately, I don't have a Windows desktop under my hand now to try it. But I use LR function to check file and move file, I was hoping it would work out of the box