LPCOpen Platform for LPC112X microcontrollers  112X
LPCOpen Platform for the NXP LPC112X family of Microcontrollers
emWin download and installation

The emWin library is not included with LPCOpen. It is available as a separate ZIP file download and installs right into the LPCOpen directory tree for Keil and IAR projects or into the LPCXpresso workspace for LPCXpresso projects. To download emWin, go the the emWin project page at:
emWin download page on LPCware.com

Once you have downloaded this files, look at the installation.txt file in the "lpcopen/software/emWin" directory for information on how to install emWin into LPCOPen.