import solution to new organization

hi every body,

i'm upgraded my crm 4 into crm 2011.

i had more plugins in CRM4 version,and after upgrading to 2011,

every plugins works fine.

now, i want to export every customization from CRM2011 ,and import them into new organization.

but when i want to import ,this problem occurred.

is there any way that don't needed to upgrade plugin source code to crm 2011 syntax an resources?

because this plugin is on working,and i'm afraid after upgrading to CRM 2011 plugin syntax and references, custom workflows damage.

please help me to fix this problem.