WDSC configuration problem halts plug-in installation

I successfully installed the new Softlanding RSE extensions in the latest
WDSC through "Find and Install".  Someone else tried installing these same
extensions on the latest WDSC and got an error.  I can see discussion of
this particular error before and the latest I see is that Mark said that
WDSC ships with some of these unfixable problems that do not cause
problems.
http://archive.midrange.com/wdsci-l/200511/msg00192.html

I saw some of the features mentioned in the error so I came up with the
bright idea to have them try using an alternate workspace.  Unfortunately,
they couldn't see any extensions to install that way.
They are too nervous based on the error they saw even after the link I
showed them hinting it was okay.  I can't say I can blame them.  They seem
very interested in installing these RSE extensions.  Is someone SURE there
is not a problem?  Has IBM verified this and said it was okay?  A link to a
knowledge base document would suffice.  Anyone know of a workaround for
this error?

Here is the error they said they got when selecting "SoftLanding Extensions
to RSE" to install them (they backed out):
Invalid combination

The current configuration contains errors and this operation can have
unpredictable results.

Host Compiled Application Launching Support (1.0.1) requires feature
"com.ibm.etools.systems.editor (6.3.0)".
Remote Systems Explorer (1.0.1) requires feature
"com.ibm.etools.systems.core (6.3.0)".
Remote Systems ISV Documentation (1.0.0) requires feature
"com.ibm.etools.systems.doc.isv (6.3.0)".
Compiled Language Debugger (1.0.0) requires feature "com.ibm.debug.pdt
(6.0.0)".
Compiled Language Debugger for Windows (1.0.0) requires feature
"com.ibm.debug.pdt.win32 (6.0.0)".
LPEX Editor (1.0.1) requires feature "com.ibm.lpex (3.0.0)".

Any ideas?
Craig