The best replacement for vuescan is silverfast.

The best alternatives to vuescan are rated as following:
★★★★★  silverfast
★★★  nikon scan
★★  epson scan
★★  scangear
★  paperport
★  image capture
★  exact scan
★  silverfast ai
  nikon scan 4
  silverfast se

Your alternative for vuescan is not listed? Suggest!
Speaking about vuescan, one probably shouldn't forget about epson v700.

Other search terms related to vuescan and their ratings are:
★★★★★ epson v700
kodachrome
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Google Trends

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vuescan
silverfast
nikon scan