I have MBP 15" from late 2011. on this computer i downloaded several lessons to learn how to play guitar. I just bought a new MBP retina late 2013, with iwork installed an mavericks and the while deal..
When i try to access my lessons on the new computer, a message appears saying that "the lesson store is not available on your Mac". If i understand correctly if i'm logged in with my apple id, it should know i have previously downloaded the lessons (probably the same way safari recovered all my bookmarks and stuff) intead telling me to make a purchase.
is it possible for mw to access my lessons from my new computer??
You can copy the lessons from your old mac or try to download them again by using the option "Restore Purchase", see: Expanding GarageBand for Mac (v10.0) content with an in-app purchase
To copy from your old mac transfer the folder
/Library/Application Support/GarageBand/Learn to Play/
from your old mac to the corresponding place on your new mac.