How to upgrade Nmap to a new WinPcap release (2009)
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1) Download the latest version of WinPcap from www.winpcap.org and make
   a note of the version (for example 4.1).

2) Update the LICENSE file, if necessary. I couldn't find a plain
   WinPcap license file anywhere. There's an HTML version at
   http://www.winpcap.org/misc/copyright.htm. You can copy and paste
   the license text from the installer into the LICENSE file which should
   be saved as PC file format (not UNIX) and ANSI encoding (not UTF-8).


3) Extract all the files from the setup file using 7-Zip
   (http://www.7-zip.org/). Enter the $SYSDIR subdirectory. One by one,
   extract (you can drag and drop) the different copies of the files.
   Copy the files into the mswin32/winpcap directory (you may need to 
   install WinPcap in order to determine the correct files; if you get
   two similar looking files it's usually the smaller one). The installed
   files at time of writing are:

        C:\Program Files\WinPcap\rpcapd.exe
        C:\Windows\system32\Packet.dll
        C:\Windows\system32\pthreadVC.dll
        C:\Windows\system32\wpcap.dll
        C:\Windows\system32\drivers\npf.sys
   
   The Vista version of Packet.dll needs to be extracted into the
   mswin32/winpcap/vista subdirectory. Right click on each Packet.dll,
   click "Properties", then select the "Version" tab. The
   "Description:" field will have a string containing "NT4", "NT5", or
   "Vista". We don't support NT4, so those files are not required.

   The AMD64 version of npf.sys needs to be extracted into the
   mswin32/winpcap/x64 subdirectory. Right click on each npf.sys,
   click "Properties", then select the "Version" tab. The
   "Description:" field will have a string containing "AMD64".

4) Open winpcap-nmap.nsi. Change the version for the following lines:

     Name "WinPcap (Nmap) X.X.X"
     OutFile "winpcap-nmap-X.XX.exe
     WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\winpcap-nmap" "DisplayName" "winpcap-nmap X.XX"

5) Get the internal 'FileVersion' from wpcap.dll. Right-click on
    wpcap.dll and select "Properties", then select the "Version" tab.
    Copy the number there into this part of winpcap-nmap.nsi:

    var /GLOBAL my_ver
    StrCpy $my_ver "X.X.X.X"  <-- file version goes here

6) Generate installer exe by compiling winpcap-nmap.nsi using the
   running the command
        makensis winpcap-nmap.nsi
   makensis is part of the "Nullsoft Scriptable Install System" at
   http://nsis.sourceforge.net/.

7) Give the installer a test, make sure the correct version appears in
   the installer's name and in Add/Remove Programs. You may also want to
   try installing it when it is already installed or an older version is
   installed.

8) Open mswin32/nsis/Nmap.nsi and update the references to the winpcap
   installer's name. You should only have to change the version number.
   The section you need to look at starts like this:
        Section "WinPcap X.X" SecWinPcap

9) Download the WinPcap developer package
   (http://www.winpcap.org/devel.htm) and replace all the files in
   mswin32/lib/ with the new versions inside the package.

10) Build the Nmap installer. The best way to do this is to run "make" in
   the mswin32 directory. This will build Nmap and run makensis for you.
   Test the installer. You may want to try it with Nmap already
   installed and with different versions installed. Also check that
   everything appears in Add/Remove Programs correctly.

11) Test Nmap functionallity that uses WinPcap (raw packet scans, raw
   packet pings, traceroute).

12) Sit back and have a cup of coffee, you deserve it :)