You're reading from the console via the <> operator. The script will only continue to the next file (as given via @ARGV) once the current file has been completely read. If you want to continue that dangerous road, you'll have to type an EOF (^Z on Win32, ^D on Unixish operating systems) after you've entered the IP address.

Let me suggest ditching the in-place-edit magic and reimplementing the loop yourself. That way, you can do away with the diamond-operator/@ARGV magic and use explicit filehandles. Maybe it's already enough to change hereistheip to the following:

sub hereistheip {
    print "Enter a valid server IP\n -->";
    my $myip = <STDIN>;
    chomp $myip;
    return $myip;
};
[download]

But I really think you're better off ditching the whole in-place approach and doing it yourself.