Page: https://www.pgadmin.org/download/macosx.php download links point to, e.g.
http://www.postgresql.org/ftp/pgadmin3/release/v1.22.1/osx/
The actual location is
https://www.postgresql.org/ftp/pgadmin/pgadmin3/v1.22.1/osx/
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Gerard Weatherby | Application Architect
NMRbox | Department of Molecular Biology and Biophysics | UConn Health 263 Farmington Avenue, Farmington, CT 06030-6406
uchc.edu