Still down and so are many mirrors (broken or empty updates)

Found one still working at https://fourdots.com/mirror/exim/exim-ftp/pcre/

Or get a copy here http://nginx-win.ecsds.eu/download/pcre-8.40-r1664-10-8-2016-svn-src.zip

Both cross-platform sources.

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nginx for Windows http://nginx-win.ecsds.eu/