To update Polyglot or LPG if you've installed a previous version:
Follow the same general procedure as for updating SAFARI, but with
reference to the respective Polyglot or LPG items.
To update IMP if you've installed a previous version:
Note: Some of the screenshots used in these instructions are out
of date in that they stilll refer to IMP as "SAFARI." The name
will be changed to protect the innocent; in the meantime, if you can
pretend that SAFARI really means IMP, these instructions should still
be good.
- From Eclipse, invoke "Help" => "Software Updates" =>
"Find and Install".

- In
the dialog that shows up, select "Search for new features to
install" and click "Next"

- Check
the item for "IMP" in the update site list on the left
and click "Finish"

- It may take several moments for Eclipse to contact the
update site and determine what updates are available.
- If you are already have the latest, you will simply get a
dialog saying something like "No updates for the currently installed
features found".
If there are any updates beyond what you already have, you
should get a dialog showing "IMP Language Tools", with children
named "IMP", "IMP Runtime", "X10DT", and "JikesPG IDE" (as
the release is currently constituted).
- Click the checkboxes next to the new versions of the
features you want to update and click "Next".
- Accept the license agreement and click "Finish"/"Next"
- Click "Install All"
- Click "Yes" when asked whether to restart Eclipse