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in "Example scripts" section, the example link for "Custom pages" is broken.
(more precisely, it redirects me to this http://nsis.sourceforge.net/Examples/Modern_UI/InstallOptions.nsi which is a non existing wiki page for me)
That example was removed by http://sourceforge.net/p/nsis/code/5494/ and somebody forgot to update the documentation. You can find the example @ http://sourceforge.net/p/nsis/code/HEAD/tree/NSIS/tags/v234/Examples/Modern%20UI/InstallOptions.nsi if you really want it but we generally recommend that new pages use nsDialogs and not InstallOptions...
Modern UI is no longer supported. Where did you get that link? It should be:
In any case, I added a <strike> around that link just in case with [r6464].