As of 14/06/21 this solve does not work!
i tried it and got the following message:
C:\Program Files\PostgreSQL\13\pgAdmin 4\bin\"C:\Program
Files\PostgreSQL\13\bin\"\psql.exe' file not found. Please correct the
Binary Path in the Preferences dialog
before i changed the path in the binary paths dialog window, it said
something like $\Dir\..\ i dont remember exactly.
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Sent from: https://www.postgresql-archive.org/PostgreSQL-pgadmin-support-f2191615.html