SSIS Packages are not backward compatible. You could rewrite the packages in 2008 format or you could install SQL 2012 in the production environment. SSIS 2012 Packages will happily communicate with a 2008 database so you also have the option of running SQL 2012 to support your SSIS side-by-side with your existing 2008 database in production but that will require you maintain two intallations.