The original PCRE library is unmaintained and ftp.pcre.org is no more.
https://github.com/PCRE2Project/pcre2
   As well as downloading from the GitHub site, you can download ...
   the older, unmaintained PCRE1 library from an unofficial mirror at
   https://sourceforge.net/projects/pcre/files/pcre/
         Check that you have the current versions of the
         <ulink url="https://sourceforge.net/projects/nsis/files/NSIS%203/">
                     NSIS installer</ulink>,
-        <ulink url="https://ftp.pcre.org/pub/pcre/">PCRE library</ulink>,
+        <ulink url="https://sourceforge.net/projects/pcre/files/pcre/">PCRE library</ulink>,
         <ulink url="https://tls.mbed.org/download">MBED TLS library</ulink>,
         <ulink url="https://github.com/google/brotli/releases">
                     Brotli library</ulink>,
 
 
       <para>
         Get the latest 8.x PCRE code from
-        <ulink url="https://ftp.pcre.org/pub/pcre/">PCRE
-                    https://ftp.pcre.org/pub/pcre/</ulink>
+        <ulink url="https://sourceforge.net/projects/pcre/files/pcre/">PCRE
+                    https://sourceforge.net/projects/pcre/files/pcre/</ulink>
         and build the static PCRE libraries with
 
         <screen>
 
 
 # why does the mingw library _not_ include .a files for libpcre?
 # *sigh* build my own pcre so I can do static linking
-# Get the 8.x PCRE library from  https://ftp.pcre.org/pub/pcre/
+# Get the 8.x PCRE library from
+#   https://sourceforge.net/projects/pcre/files/pcre/
 inc="/source/pcre-8.45/"
 lib="/source/pcre-8.45/.libs"
 CPPFLAGS="${CPPFLAGS} -I${inc}"