Yesterday I was trying to install PostgreSQL 17, the latest version. There I could not find the EDB Language Pack. I looked up around for the solution, didn't find the solution anywhere. Then I emailed the author Anthony DeBarros, of the book I'm following "Practical SQL, 2nd edition". He suggested to install the previous version, or wait until the developers add EDB Language Pack to PostgreSQL 17. So, I installed the previous version, PostgreSQL 16.4.2. And guess what, the package was there in the Stack Builder.

Thanks to this wonderful author, Mr. Anthony DeBarros.