You can buy it and download it HERE.
The main PROJECT rulebook (recently updated with some fixes and a separate character sheet download) can be found HERE. (It’s also on sale as part of RPGNOW’s science fiction month until the end of May).
We heard you when you said you wanted more background information, so these class books will contain extra information about the setting as well as equipment, weapons, advantages, disadvantages and information on the enhancement process for each PROJECT enhancement. This one contains information about the PROJECT world’s medical systems and even about ‘traditional medicine’ in a world full of monsters and strangeness.
PROJECT currently holds 4/5 stars on reviews. It is based on the Open D6 system.