In most browser, just drag and drop the install.html to the browser window. Note, that an active internet connection is needed to retrieve the search results from europeana.eu.
Some browser version require to disable the same origin policy in order to retrieve results from 3rd party (non-local) websites. For Chrome do the following:
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Close all instances of Google Chrome
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Start an instance with the parameter '--disable-web-security' (Therefor, open a terminal/console and navigate to the installation directory of your Chrome Browser. Now type in the appropriate command for your OS.)
$ chrome.exe --disable-web-security (WINDOWS)
$ open -a Google\ Chrome --args --disable-web-security (OS X)
$ google-chrome --disable-web-security (LINUX)
Seifert, C.; Jurgovsky, J. & Granitzer, M. FacetScape: A Visualization for Exploring the Search Space Proc. International Conference on Information Visualization (IV), 2014, to appear (use tag "iv2014" to get the version used in the publication)