Yes, Atleast for me I had to downgrade JDK for installing plugin.
If I was installing Agentry Editor Plugin in Eclipse using JDK 1.7 then downloading was getting stopped at 49%.
Error message was in eclipse " Collecting items can't be found and was popping up a error dialogue after a long time"
After switching to JDK 1.6, I was able to install Editor Plugin and both Agentry prespectives are up and running.
Best,
Prateek