Install Gdn-theme.zip

Hello all
I buy a wordpress theme from ThemeForest with the name:
themeforest-16897309-gdn-magazine-blog-video-theme.zip and inside of this file there is a compressed file gdn-theme.zip. and when I try to install gdn-theme.zip impossible to install.
Help me to install the zip file.
NB: My site is locally

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