[Zope] How to import products developed in zope2.4.0 to zope2.3.3

[Dhanu]

Hi,

I had written products ,zclass products,in zope 2.4.But zope 2.4 is crashing
very often.So i want to launch site in zope 2.3.3.

Iam unable to import products,.zexp files, in zope 2.3.3 .Iam getting

No module named "pluginindexes.textindex.splitter.zopesplitter " error.

Can any body tell me ,how i can import,

regards,

Dhanu