Off the top of my head, this should workedit:
Suppose you write down your private keys and then uninstall the full node from your computer completely. Then, you download bitcoin core 15.0 [removed a part about upgrading.1 Lower part still remains relevant I think, and tell it to download the entire blockchain for you. Itso I think I will be considerably faster than your old node due to improvements to its code.
Oncekeep it is fully synced, you import your private keys into the new bitcoin core node and your coins will be ready to spendthere.]
I don't know of any place where you can download the latest compatible blockchain, but more importantly you should never want to do so! If you download it from some shady site, what guarantees would you have that the chain has not been tampered with, or that it will contain trojans, keyloggers or the like, which could lead to loss of funds/time. Just install the bitcoin client of your choice and let it download the blockchain through its connected nodes. It can verify the contents and make sure you are on the right chain.