To get a Clio module and install it in project's Clio env, you can do:
clio get https://example.com/packages/package.tar.gz
Clio get can install from a url (compressed package), a git repository (@version eg.
@1.2.2 is supported) or from the official Clio repository. For a list of packages that exist in the official repository you can visit the official package index repo.