Shamim's Plugins

Are you pointing same file where your wordpress installation is?
If you are is development you can use our latest rc version (enable Bleeding edge Update in Front End PM PRO > Settings > Licenses to get this) where you can use POP3 instead of piping.
After update go to Front End PM > Settings > Emails > Email Piping/POP3

Please follow https://www.shamimsplugins.com/docs/front-end-pm-pro/troubleshoot/license-keys-not-activating/
Let me know.

Can you give me screenshot of your “Role to Role Block” settings? It should not return users which are blocked for “New Message”.
PRO version “To” is so many features involved (Multiple Recipients, Only admin, Group Message etc). So changing anything here a little bit tricky. After that also i will try to add an option in next version so that it can be used as FREE “To”.

How did you set so that it does not return user (only showing searching…)?
If you want to restrict user so that they cannot send message to same role user, better way to use “Role to Role Block” feature. Instruction in https://www.shamimsplugins.com/docs/front-end-pm-pro/getting-started-2/role-to-role-block/

I did not get it. Did it show successfully sent? Please sent again.

You have setup piping address as URL but it will be PATH. Something like home/xxxx/public_html/wp-content/plugins/front-end-pm-pro/pro/fep-email-parser/fep-email-piping.php

For no-2, add yourself to every group and add following code in your theme’s (child theme’s if any) functions.php

add_filter( 'fep_get_option', function( $value, $option ){
    if( 'can-send-to-group' == $option ){
        if( fep_is_user_admin() ){
            $value = true;
        } else {
            $value = false;
        }
    }
    return $value;
}, 10, 2 );

This will allow only admins to send message to group.

For no-1: Is there any JavaScript error in your browser console?

Add following code in your theme’s (child theme’s if any) functions.php

add_filter( 'fep_filter_get_message_with_replies', function( $args ){
    $args['order'] = 'DESC';
    return $args;
});

To show form on top, You have to edit view-message.php template. Instruction in https://www.shamimsplugins.com/docs/front-end-pm-pro/customization-front-end-pm-pro/change-templates/