the demo has been updatedso the 2nd link does not work, and the reason errors ever occured for the demo is somone abused the demo. if you goto
www.gamasoftware.com and click demos you shall see the current version RCS 1.5 Pre Release. Before the next release though we plan to sneak even more features in. As for people asking about complete integration, due to the software being for vbulletin 2 originaly then vb 3 came out it caused problems like rendering my old software almost obsolete, so to prevent that from happening anymore, or even ever again, i have made the software standalone with links to other softwares such as vbulletin(however it works with many other softwares). It does connect to the vbulletin database so if you desired you could hack in other features and even tie it further in, which requires some hacking, however, the whole point was not to make it less integrated with vb so much as prevent vb from putting my hard work into a useless old hack for an outdated software.
I personaly plan to make many new hacks for rcs to further integrate vb3 and rcs, and gold for users is integrated already as well, and being as they still share the same database all the things from the old 1.0-1.3 version, are indeed still possible, and shoulnt be too hard to create.
I havnt used ZT's hack however i am confident that the RCS is the most powerful and innovated RPG system out there, and with the admin back end and controls i doubt that there will be any that will be better than it.
Specialy after version 1.5 final... :P
Anyways, the choise is yours, hopefully you are happy with your choise.
Enjoy!