Там же понятным ежу уже языком написано:

INSTALLATION: Double-click wordfast.dot.
Press Ctrl+Alt+W if installation does not start automatically.

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If installation cannot be completed because of macro security settings:

Start Ms-Word. Use the "Tools/Macro" menu.

1. If there is a "Security" sub-menu, set security to "medium".
2. If there is a "Trusted sources" pane, go there and
check the "Trust the Visual Basic project" checkbox.

(Office 2007: Click the Office button, then "Word options".
Select "Trust Center". Click "Trust Center Settings" and do
the following:
- Under "Macro Settings", select "Disable all macros except
digitally signed macros" and check "Trust Access to the VBA
project object model".
- Under "Message Bar", make sure "Show the Message Bar in all
applications when content has has been blocked" is checked.
Click "OK" to quit the "Trust Center" dialog.)

3. Close Ms-Word.

Double-click wordfast.dot to retry installation.

A message about macros may appear. If there's a "Trust documents from
this publisher" box, check it. Click "Allow macros".

(Office 2007: If "Security warning - Macros have been disabled"
appears in Word, click "Options", check "Trust documents from
this publisher", and confirm by clicking OK.)

If the automatic installation procedure fails, download the English manual,
go to the "Installation" section, which shows two other installation procedures.

Very kind regards,
Yves Champollion