Hi, The Hard drive on my MBP 2013 model just died so I purchased a new 1TB Seagate SSHD. The problem is, all the tutorials on how to install the new OSX says that I have to login the apple store to download the Mac OS. My office computer runs on Windows 10 and I have no other Mac computer where I can download the OS sierra. Can you guys help me out and tell me how I can install the MacOS Sierra on my new blank Hard drive? I had a snow leopard DVD before but I can't seem to find it. I also don't really want to install snow leopard then keep upgrading upto Sierra. I would rather have a clean direct install of Sierra. Thanks. Note: I have a new 16GB and 32GB USB drive for this.