I am having problems getting the plugin installed in Eclipse.
I am running: Eclipse Java EE IDE for Web Developers.
Version: Neon.2 Release (4.6.2)
One way to get around the problem and install the plugin is:
A) Open https://sourceforge.net/projects/jasperstudio/files/updatesite/6.3.1/
B) Download full-site.zip
C) Eclipse -> Install new software -> Add -> Location (Archive -> full-site.zip)