Where is the Viewer button now?

It's gone, click on the MMPlayer tab in main screen for Multimedia viewer, Progress tab for progress viewer.

Whats "added list" in add dialoge?

You can press the "Masked selected file to added list" button to add files in different dirs,

Why cant I Drag and Drop folder?

Use right click to drag instead of left click.

Do Quick Zip support command line?

Yes, please check here.