Convert SQL Server 2012 SSIS package to 2008
Yes,  you'll need to recreate the package in 2008. 2005/2008 packages can be upgraded to 2012, but downgrading doesn't work.

There is a codeplex project/utility that can move 2008 packages to 2005 by changing version numbers, and making small changes to the XML. Unfortunately this approach doesn't work with 2012, as the package format went through some big changes.