I have some applications built on phalcon version 2, but since the release of the version 3, new installations of phalcon default to version 3.
You need to install phalcon from source, but instead of build from the master branch switch the branch to the 2.0.x branch.
git clone --depth 1 https://github.com/phalcon/cphalcon.git
cd cphalcon
git remote set-branches origin '2.0.x'
git fetch --depth 1 origin 2.0.x
git checkout 2.0.x
cd build
./install
I created this gist to make this easier - https://gist.github.com/goke-epapa/c325da217296ec4880850972be955bf0
UPDATE
I've been told that the above snippet installs version 2.0.10, so the snippet below is specifically for version 2.0.13
git clone --depth 1 https://github.com/phalcon/cphalcon.git
cd cphalcon
git remote set-branches origin 'phalcon-v2.0.13'
git fetch --depth 1 origin phalcon-v2.0.13
git checkout phalcon-v2.0.13
cd build
./install
Update
Both code snippets were missing the cd cphalcon
command so I modified the snippets.