Shamim's Plugins

1. You can add following code to set 2 urls depending on the user

add_filter( 'fep_query_url_without_esc_filter', function( $url, $args ){
    //Check here user and return url accordingly
    return add_query_arg( $args, 'https://example.com');
}, 10, 2);

Go to Front End PM PRO > Settings > Appearance > Load CSS file and set as “Always”
2. Announcements are sent according to roles. You can check to which roles you want to send announcements
3. follow https://www.shamimsplugins.com/docs/front-end-pm/getting-started/show-unread-message-count-in-menu/

Thank you for letting me know. I am still trying to figure out the conflict with WP version 5.7.1
After uninstall this plugin does not have any capability to create any issue. If you get that error message after this plugin uninstalled, That means that error is coming from somewhere else. You can give me the the error page link and i can try to find out where that error is coming from.

You can follow https://www.shamimsplugins.com/support/topic/change-front-end-text/#post-22945

Can you please try only following code? (remove fep_admin_cap code)

add_filter( 'register_post_type_args', function( $args, $post_type ){
    if( 'fep_group' == $post_type ){
        $args['show_in_menu'] = true;
        $args['capability_type'] = 'post';
    }
    return $args;
}, 10, 2);

Let me know. This way you do not need to give other users admin access then modify by other plugin.

Can you please try following code along with above code

add_filter( 'fep_admin_cap', function( $admin_cap ){
    return 'manage_options';
});

Change capability here as well. This will give that user admin capability (eg. see all messages etc), so use with caution
Let me know.

It is a deprecated warning, So nothing to worry.
We will fix that in next version.

Add following code in your theme’s (child theme’s if you are using) functions.php

add_filter( 'register_post_type_args', function( $args, $post_type ){
    if( 'fep_group' == $post_type ){
        $args['capability_type'] = 'manage_options'; //Change this as you need
    }
    return $args;
}, 10, 2);

Let me know

It is always better to use a child theme for modification.