Problem on instaling eclipse plugin

Hi, i’m trying to instal the eclipse plugin for Eclipse Juno SR2 win32 from eclipse marketplace and got an error almost finishing the download of vaadin:

An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Artifact not found:
Problems downloading artifact: osgi.bundle,com.vaadin.wysiwyg.eclipse,
MD5 hash is not as expected. Expected: 21006b67bf741b155d4712e6fd878fee and found f646421aa3ed6166b6553da0bf04a752.

Thanks for reading, and sorry for my English.