1) All the plug-in's I'm using on Win8 work fine.
2) Windows 8 ships with DirectX 11. DBPro uses DirectX 9. Just download and run the directX 9 installer and you should be good to go. (I personally needed to manually download and copy an additional 8 directx dll files, which were easy enough to find.
3) No one knows...
4) Yes, it'll work fine in all versions of windows.
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