textpad_installer is an NSIS installer I whipped up to download and install TextPad 5.0.3, and all of add-ons found at http://www.textpad.com/add-ons.

You can download the binary here and the binary with the source code here.

Here's the changelog.txt:

textpad_installer changelog

Version 1.6 - 08 Sep 07:

	Upgraded TextPad to 5.03

Version 1.5 - 05 Apr 07:

	Fixed user defined start menu folder bug
	Upgraded TextPad to 5.02
	Updated Syntax definitions
	Upgraded NSIS to 2.24 (2.25 appears buggy)

Version 1.4 - 21 Aug 06:

	Upgraded NSIS to 2.19

Version 1.3 - 20 May 06:

	Fixed AutoIt syntax and clip unzip bug

Version 1.2 - 17 May 06:

	Added AutoIt syntax and clip libraries

Version 1.1 - 12 May 06:

	Download errors are retried 5 times before reporting failure

Version 1.0 - 14 Apr 06:

	Initial release

and here's the readme.txt:

textpad_installer - Version 1.5 - 05 Apr 2007
Copyright (c) 2005-2007 Ross Smith II (http://smithii.com) All Rights Reserved

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textpad_installer lets you download and install TextPad, and many of the 
freeware add-ons available at http://www.textpad.com/add-ons/.

textpad_installer looks in the directory where textpad_installer.exe is for 
any files it needs before attempting to download them. If it does download a 
file, it will attempt to save a copy of the file in a directory below the 
directory where textpad_installer.exe was found in.

The add-ons will be installed in the 
C:\Documents and Settings\%USERNAME%\Application Data\TextPad directory.
Any add-ons with the same name in this directory will be overwritten without
warning.

Please note, if you select 'All', some add-ons have the same filenames as 
other add-ons, so the one listed later, will overwrite the one listed earlier.

If you use the /S option, the installer will re-install TextPad, even if it's
already installed.

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Usage: textpad_installer [options]

Options:
/S         Install the application silently with the default options selected
/D=path    Install into the directory 'path' (default is 
           %ProgramFiles%\textpad_installer)
/INSTYPE n Where n is a number between 0 and 3:
           0: TextPad Only (Default)
           1: All Add-Ons Only (TextPad should already be installed)
           2: TextPad + All Add-Ons
           3: None
/RETRIES n Number of times to retry each download before reporing failure
           (default: 5) (NOT YET IMPLEMENTED)
/PROXY     Set proxy settings (NOT YET IMPLEMENTED)
/ALLUSERS  Install icons for all users (NOT YET IMPLEMENTED)
           This is the default if the user is an administrator
/USER      Install icons for the current user only (NOT YET IMPLEMENTED)
           This is the default if the user is not an administrator
/VERSION   Show the version and quit (NOT YET IMPLEMENTED)
/?         Show this help message and quit (NOT YET IMPLEMENTED)