Larry,We had reposted some changes to the website and a DLL was missing which generated the error that you encountered when downloading your license file. You should now be able to get back out there without any issue...sorry for the trouble
As for the help documentation, there is actually quite a bit there in the 1.6 help docs. Do you not have these help topics?
The topic labeled "Step5: Configure the Client Data Source item" shows how to implement the EnterpriseDataSourceItem on the client side. You can also look at the ES sample that comes with the framework to see how it is plumbed in.
Please let me know if for some reason you are missing the help topics shown above or if you have any other questions. Thanks!