vb.org Archive - View Single Post - Demotion of users using standard Promotions?

I need to do a simple thing in general =)

But can't understand how can it be done with standard promotion system of vB.
Thinking that a need a mod for this, but maybe i'm wrong.
If anybody can help or give an adviсe - i'll be very grateful.

So i need to do only this demotion:

If user joined the board already for X days or more, AND number of his posts less then Y - then he moved (not pruned) to another group.

Returning user back into normal group can be done with vB promotion system =)
But how about demotion... I'm stuck here... =)

X vBulletin 3.8.12 by vBS Debug Information
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X vBulletin 3.8.12 by vBS Debug Information

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More Information

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Messages:

X vBulletin 3.8.12 by vBS Debug Information
Page Generation 0.01221 seconds Memory Usage 1,755KB Queries Executed 11 (?)
More Information
Template Usage: (1)SHOWTHREAD_SHOWPOST (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (1)footer (1)gobutton (1)header (1)headinclude (6)option (1)post_thanks_box (1)post_thanks_button (1)post_thanks_javascript (1)post_thanks_navbar_search (1)post_thanks_postbit_info (1)postbit (1)postbit_onlinestatus (1)postbit_wrapper (1)spacer_close (1)spacer_open Phrase Groups Available: global postbit reputationlevel showthread	Included Files: ./showpost.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/functions_bigthree.php ./includes/class_postbit.php ./includes/class_bbcode.php ./includes/functions_reputation.php ./includes/functions_post_thanks.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_postinfo_query fetch_postinfo fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete showpost_start bbcode_fetch_tags bbcode_create postbit_factory showpost_post postbit_display_start post_thanks_function_post_thanks_off_start post_thanks_function_post_thanks_off_end post_thanks_function_fetch_thanks_start post_thanks_function_fetch_thanks_end post_thanks_function_thanked_already_start post_thanks_function_thanked_already_end fetch_musername postbit_imicons bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete postbit_display_complete post_thanks_function_can_thank_this_post_start showpost_complete
Messages: