V9 interface
If you're not happy with the new V9 interface, you can always go back to the old one.
Open the popup or side bar, go to Settings
Then More Settings
Near the bottom you'll find a Use legacy UI checkbox
If you are using the old UI and you want to restore the new V9 UI, go to Settings
Then click on Enable New UI button
Open the popup or side bar, go to Settings
Then More Settings
You'll find a field to paste or type your license key, then click on Check license key
Open the popup or side bar, go to Settings
Then More Settings
Go down and you will find a Download directory section with a link to Change it.
This documentation is about Video DownloadHelper.