The Install New Software option requires minor modification to the CodeWarrior V10.x site pointers to enable correct behavior.
If you have problem to access an updater site, add a backslash to the end.
For example, add a backslash at the end of the Freescale update site:
http://freescale.com/lgfiles/updates/Eclipse/MCU10_1/com.freescale.mcu.updatesite/
Similarly, for SVN Connectors site:
http://www.polarion.org/projects subversive download/eclipse/2.0/update-site/
For other sites, such as:
http://download.gna.org/eclox/update
backslash is not required, however it seems to be a safe practice to add `/' at the end of all the updater sites.