Because these are not available in the built-in VirtualDJ "Extensions" tab, you must follow these manual steps: Serato Skin - VirtualDJ
The legitimate source for these skins is the section (formerly the Skin Factory) or the VDJ Forums . serato dj 1.9 1 skin for virtual dj download
Frequently hosts the Serato DJ 1.9 & 2.0 Combined Skin for Virtual DJ users. Because these are not available in the built-in