Сам не пробовал, но , как понял, инсталлируется так:

PSoC Designer v4.2 (C) Cypress Microsystems on the 19/11/2004

Installation information
------------------------

1. Unzip and unrar.
2. Install.
3. License for option #6 is: WR99228-ISOxsk
3.1) Start PSoC Designer.
3.2) Complete the Start wizard dialog.
3.3) Select the Tools drop down menu.
3.4) Select the Options... submenu.
3.5) Select the Compiler tab at the top of the Options
dialog.
3.6) Enter your Compiler license into the entry
field.
3.7) Check the Accept box (if you agree with the EULA).
3.8) Select OK.