ObjectAid UML plugin for Eclipse?

Question

I have a problem with the installation ObjectAid UML plugin for Eclipse.

‘Installing Software’ has encountered a problem.
An error occurred while collecting items to be installed
An error occurred while collecting items to be installed
session context was:(profile=_home_aleksandar_eclipse_java-neon4_eclipse, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to read repository at http://www.objectaid.net/update/plugins/com.objectaid.uml_1.1.10.jar.
Premature end of Content-Length delimited message body (expected: 1107319; received: 940909

I unchecked 'Contact all update sites during install to find required software, but doesn't work. Does anyone know what's the problem?