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# These are the steps I followed to install a specific version of PostgreSQL using Homebrew
brew search postgresql
 
# You will get a list of versions, pick the one you are looking for and use that next
# e.g. 'homebrew/versions/postgresql92' 
brew install homebrew/versions/postgresql92
 
# If you  get an error like: 
    # Error: An unexpected error occurred during the `brew link` step
    # The formula built, but is not symlinked .... 
# Then you need to run:
brew link postgresql92