Can I get a replacement installation disc for shake from apple?-my existing disc is scratched beyond repair...?

I purchased shake 4 in 2009 but due to a very annoying accident whilst moving house my installation disc is srcatched beyond repair...and sadly no I don't have a backup copy!:(

Does anyone know how I can get a replacement copy from apple despite it being discontinued?

Many thanks for any help offered,

H:o)