Don't use the Windows "Copy to Clipboard" method. On Mac, use Command + Shift + 4 to grab a clean screenshot of your network, or use the SVG export inside VOSviewer. Drag that SVG straight into Keynote or Illustrator. Because it is vector, you can zoom in on citation clusters without pixelation.
Java version 8 or higher must be installed on your system. vosviewer for mac