where ADS from Agilent ?

I have never heard of such a thing. Try contacting their sales department and ask. If you are at a school ask the department head to inquire into having a program donated to your school.

There is no demo version for ADS.

If you ask Agilent and show interest in ADS you will receive from them a demo version, I donot remeber but I think it is for 30days evalaution.
So trry and ask them
kind regards Michael