The Corpus Contemporary Dutch (Corpus Hedendaags Nederlands, CHN) is only accessible via its online search interface. Due to copyright, there is no download option available.
However, for non-commercial use, there is a good alternative: the SoNaR corpus contains over 500 millions words and can be downloaded. The texts of this corpus have been annotated with (machine-generated) lemmas, named entities and POS-tags.
To download the SoNaR corpus, a separate account at the IvdNT is required.