I get this:
You are now connected to database "test" as user "postgres". test=# \i C:/Users/ANUJ MISHRA/Downloads/human.sql C:/Users/ANUJ: No such file or directory
I get this:
You are now connected to database "test" as user "postgres". test=# \i C:/Users/ANUJ MISHRA/Downloads/human.sql C:/Users/ANUJ: No such file or directory
You appear to be using a directory that has at least one SPACE character in it, and that interferes with command line parsing.
Quote the filespec, use
\
to insert a literal SPACE character, or put the *.sql files of interest in another directory whose pathname lacks SPACEs.