That tutorial might be outdated.
You can find the archive at:
https://bitcoin.org/bin/I think you should be using 0.11.1 version in order to get the best performance and features, and also security updates if any.
64 Bits CPU (OS: Linux):
wget https://bitcoin.org/bin/bitcoin-core-0.11.1/bitcoin-0.11.1-linux64.tar.gz
32 Bits CPU (OS: Linux):
https://bitcoin.org/bin/bitcoin-core-0.11.1/bitcoin-0.11.1-linux32.tar.gz