Downloading and installing Babelfish
Babelfish source distributions are available for download from:
https://github.com/babelfish-for-postgresql/babelfish-for-postgresql/releases
Each bundle contains a file named INSTALLING.md that includes detailed build instructions that will walk you through building from source for the version in the archive. The instructions include directions for installing and building Babelfish dependencies as well.
The instructions detail installation on Ubuntu 20.04. Please note that if you are building on a platform other than Ubuntu 20.04, the instructions may differ.