How do I go back to IQ 3.0 in Eclipse?

I upgraded my Eclipse environment to SDK 3.1.4 and the plugins to 3.1.3.

Since I am not very happy witjh this setup because of all the bugs in CIQ 3.1.4 I'd like to go back to a CIQ 3.0 environment.

The plugin does not allow me to reinstall SDK 3.0.12 and I can't seem to find how to install an older version of the plugins.