You can either reference one of the assemblies in the download depending on what framework you target:
assemblies/ net20/ TallComponents.PDF.Rasterizer.dll net30/ TallComponents.PDF.Rasterizer.dll net40/ TallComponents.PDF.Rasterizer.dll net40-client/ TallComponents.PDF.Rasterizer.dll net40-wpf/
Or you can install with NuGet:
PM> Install-Package TallComponents.PDFRasterizer
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