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  1. or download this
    my $txtfile = $prefix . ".txt";
my $txtfile1 = $prefix . "1.txt";
...
} else {
 # no file was found
}
  2. or download this
    if ( -f $txtfile || -f $txtfile1 ) {
 if ( -f $txtfile ) { open(FILE, "$txtfile"); }
...
} else {
 # no file was found
}