The Postgres Pro 9.6.8.1 sources can be obtained from the download section of our website: https://postgrespro.com/products/download. You should get a file named postgrepro-9.6.8.1.tar.gz or postgrespro-9.6.8.1.tar.bz2. After you have obtained the file, unpack it:

gunzip postgrepro-9.6.8.1.tar.gz
tar xf postgrepro-9.6.8.1.tar

(Use bunzip2 instead of gunzip if you have the .bz2 file.) This will create a directory postgrepro-9.6.8.1 under the current directory with the Postgres Pro sources. Change into that directory for the rest of the installation procedure.

You can also get the source directly from the version control repository, see Appendix J.