Acad 2006/Softdesk 8?

Does anyone know of a way to get Softdesk 8 to work with Acad2005 o Acad 2006? We are a Structural Engineering firm and this progra
works like a "well oiled machine" for what we do here. Unfortunatel no other 3rd party software works quite as well with the newer CA software
Thanks for any input
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