It seems the Download as CSV button doesn’t work any more for the last few versions. I upgraded from version 3.3 (didn’t work here) to version 4.2 and it still doesn’t work. It used to work before version 3.3 and downloaded the current query results to the c:\Downloads folder which was very handy. Not sure if I am doing something wrong?
Just tried pgAmin 4.4 running against PG 10.7 64-bit on Windows 7, and the Download as CSV button works fine here.