I have Yosemite installed on a Mid 2010 MBP 13". It originally came with Snow Leopard installation DVDs before the Mac App Store was introduced.
I want to clean install Yosemite, but many of the standard applications came on a separate DVD with Snow Leopard and I'm not sure if I clean install Yosemite whether I'll be able to install the applications from a DVD of an older version of OS X.
How would I be able to clean install while still being able to install the apps afterwards? Apps like iMove, for example, weren't purchased from the App Store, so I would have to purchase them again to install them through the store.