In linux, I successfully added this repository by deleting files from the eclipse folder. Of course, make a backup before deleting any files.
p2/org.eclipse.equinox.p2.engine/profileRegistry/pdtProfile.profile/.data/.settings/org.eclipse.equinox.p2.artifact.repository.prefs p2/org.eclipse.equinox.p2.engine/profileRegistry/pdtProfile.profile/.data/.settings/org.eclipse.equinox.p2.metadata.repository.prefs
But before that I had the same mistake. I tried to add a repository for installing the plugin, but instead I got a "Duplicate Location" error, even if this entry did not appear in the "Available Program Sites" window.
EDIT: Watchful. This will remove other update / install installation locations. Ultimately, you can search and replace existing links from the files above. But I did it my own way, faster (I don't need other places in the software repository)
slava
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