Source: https://www.ni.com/docs/de-DE/bundle/whats-new/page/change-ni-help-preferences.html
To use the NI Offline Help Viewer, you must first change your NI Help Preferences to disable the use of online help.
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From the Windows start menu, navigate to National Instruments » NI Help Preferences.
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In the NI Help Preferences window, disable Use online help.
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Click Apply.
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Launch the documentation from the Help menu in your NI product. Your NI product will automatically launch the installed version of the documentation in the NI Offline Help Viewer.
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Optional: In the NI Offline Help Viewer, click Language to change the language.
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Optional: In the NI Offline Help Viewer, click Navigate » All Manuals to see a list of other documentation sets you can access without connecting to the internet.