Can I download the blockchain blocks from torrent and paste them? Currently my Bitcoin Core client was stopped syncing at 40.73%.  It was not progressing any more.  I've downloaded the Blockchain from https://getbitcoinblockchain.com/ .  Can I just copy these blocks and paste these downloaded blocks to my Bitcoin > Blocks ?  Will everything be fine ?  Will the Bitcoin Core client accepts the downloaded blockchain ?
Yes you can download the blockchain from other sources then paste it inside the your main bitcoin folder.
You will need two folders:
- blocks
- chainstate
Then open bitcoin-qt for synchronization.