ColdFusion 9 Update 2 is an updater to CF 9.0.1 which is a full installer. There is only full installer and updater installer (alpha of changes ) is not there.

It can be summed up as:

ColdFusion 9 Update 2 =  ColdFusion 9 + Update 1 + HotFixes + Security HotFixes – Verity.

You can download ColdFusion 9.0.2 from: http://www.adobe.com/support/coldfusion/downloads_updates.html#cf9

As this is a full installer it doesn’t require you to have CF 9 on your machine.

This installer can be run in UI or Console mode depending on the platform you are running on.

This is something you have to do manually. However, you can automate this process by performing silent installation.

To
perform silent installation you need to have the installer and a
properties file (say file named cf902silent.properties) that installer
will use to install it silently. What properties file should contain is
explained hereunder.

Place the installer and the properties file in a directory. Open the command prompt and

start the installer silently as>ColdFusion_9_WWEJ_win.exe -f cf902silent.properties

Once
you invoke this command prompt you can see an installation process in
the background (On Windows you can see it in the task manager)

Following
are the sample properties file for different type of installations and
platforms. Please make sure to update the flags/paths/serial
numbers/passwords in the properties file before using these properties.

Note:Web server connector is not configured during silent
installation though the ColdFusion webroot files are placed as required.
You will have to run wsconfig tool to configure connector. As this can
be done using scripts this also can be automated.

For more details you can refer to: ColdFusion 9.0.2 Silent Installation Details

Multi Server installation on Windows with License

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INSTALLER_UI=SILENT

SILENT_LICENSE_MODE=full

SILENT_SERIAL_NUMBER=XXXX-XXXX-XXXX-XXXX-XXXX-XXXX

#Enable the following property if you have upgrade license.

#SILENT_PREV_SERIAL_NUMBER=XXXX-XXXX-XXXX-XXXX-XXXX-XXXX

SILENT_INSTALLER_TYPE=jrun

SILENT_INSTALL_FOLDER=C:Jrun4

SILENT_WEBROOT_FOLDER=C:Jrun4serverscfusioncfusion-earcfusion-war

SILENT_INSTALL_ODBC=true

SILENT_INSTALL_SOLR=true

SILENT_INSTALL_JNBRIDGE=true

SILENT_INSTALL_SAMPLES=false

SILENT_ADMIN_PASSWORD=Adm1n$

SILENT_ENABLE_RDS=false

#Enable the following if  SILENT_ENABLE_RDS value is true

#SILENT_RDS_PASSWORD=Adm1n$