There are two issues here: Should H11 repelace H10 or update ? 1) Eclipse update manager works by *adding*, there is not mechanism for removing plugins. I've heard something about P2 will do some "garbage collecting" but I have not seen it in effect. 2) Why does the update not work at jboss tools nightly build update site ? We f*cked up and the R and N build got temporarily mixed up causing the problem you are having since you (un)luckily got the mixed up nightly build. Sorry for the trouble! View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4215903#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...