Building the adapter firmware from the source code
Downloading source code
The AllPro adapter source code project for LPCXpresso IDE is here.
Installing the LPCXpresso IDE
The LPCXpresso IDE is a Eclipse-based IDE software development toolchain for NXP LPC microcontrollers based on ARM Cortex cores featuring industry-standard GNU toolchain . The Free edition supports project code size up to 256 kB. In order to download NXP's free LPCXpresso IDE, you do need to create an account on NXP website, at https://www.lpcware.com/lpcxpresso/download.
Importing and building project
Once you have this .zip file available somewhere on your computer, open up the LPCXpresso IDE, and click the "Import Project(s)" in the "Quickstart Window". Building the project should be straight forward.
For using LPC-Link2 as a debug probe check this page.