Does the tool support dual-layer DVD discs for burning?
No. Currently, the tool does not support dual-layer DVD discs.
From here: Windows USB/DVD Download Tool - Microsoft Store
Kari, are the ISOs like Windows 7 where all versions are contained on any ISO file. Could you use the eicfg tool to remove the version and have an all version?
Of course, if you have a valid Pro key you can install using Home edition and then simply enter the Pro key in Settings > Update & Recovery > Activation > Change Product Key to upgrade Home to Pro.
¹ N versions = Windows without Windows Media Features (WMP), intended for European market, KN versions the same for Korean market.