NetWare 6 Support Pack 1 includes NMAS 2.02 Standard Edition and automatically installs it during the installation process.
Once you have installed this version of NMAS Standard Edition, if you want to upgrade it to NMAS 2.0 Enterprise Edition, you need to answer "No" during the Enterprise Edition installation when asked if you want to replace the newer NMAS Standard Edition files on your system with the older ones included in NMAS 2.0 Enterprise Edition. By answering "No" and not overwriting the newer files, it will bring the previously installed NMAS Standard Edition to a full Enterprise Edition with full functionality and bug fixes.