Eclipse Helios for RCP and RAD developers won't update to 3.6.2

I got a strange behavior with an Eclipse installation:

Even though all update sites are there and accessible, and even though I can SEE in "Install New Software" dialog that there is the new Eclipse Platform 3.6.2.M20110210-1200 I cannot get it installed! Of course it says here that the original request has been modified:

Your original request has been modified.开发者_如何学运维
  "Eclipse Platform" is already installed, so an update will be performed instead.
Cannot complete the install because of a conflicting dependency.
  Software being installed: Eclipse Platform 3.6.2.M20110210-1200  (org.eclipse.platform.ide 3.6.2.M20110210-1200)
  Software currently installed: Eclipse for RCP and RAP Developers 1.3.1.20100916-1202 (epp.package.rcp 1.3.1.20100916-1202)
  Only one of the following can be installed at once: 

But when I invoke "Check for Updates" it simply says "No updates were found."

Why?? How can I get it to the latest platform release? Thanks!

If I understand the comments on this bug report correctly, the update or parts of it have currently been disabled because of an issue when updating Eclipse on Mac OS X. It seems you/we (I'm having a similar problem) can either wait for a bit or try using the update site mentioned in the comments:

http://download.eclipse.org/technology/epp/packages/helios/SR2.fixed

I haven't tried this myself, though.

Eclipse is distributed by different packages, such as classic, SDK, CDT and Eclipse for RCP and RAP Developers that one already installed or downloaded by you.

Eclipse platform is a part of those distribution, so you can installed it again.

You could enable/add the software repository(http://download.eclipse.org/releases/helios) in your eclipse, then let it check the update. It should find the proper updates for you.