The complete NWChem documentation can be found here.
The SRC only file of Nwchem 7.0.2 can be downloaded as follow.
wget https://github.com/nwchemgit/nwchem/releases/download/v7.0.2-release/nwchem-7.0.2-release.revision-b9985dfa-srconly.2020-10-12.tar.bz2