problem after update to 2 02, back to 1.4

Hello,

i encounter problems after upgrading to 2.02, same as : https://stackideas.com/forums/problem-after-update-to-2-02

Site was down and :
easyblog page ok,
kunena and ES pages were not ok... especially when i used user link from kunena...

So i decide to step back to ES 1.4... using backup
now ES and the site is not working pretty well anymore... SQL queries seems very long or with error

i can't install ES package using joomla install :
http://screencast.com/t/Q75eBx7orUD

and ES admin is not working pretty good, specially dashboard and user page :
http://screencast.com/t/ZUTzoellAq

i have these error for exemple :
SQL=SELECT COUNT(1) FROM (SELECT `a`.*,`b`.`type`,SUM(`p`.`points`) AS `points` FROM `#__users` AS `a` LEFT JOIN `#__social_points_history` AS `p` ON `p`.`user_id` = `a`.`id` LEFT JOIN `#__social_users` AS `b` ON `a`.`id` = `b`.`user_id` LEFT JOIN `#__social_profiles_maps` AS `e` ON `e`.`user_id` = `a`.`id` GROUP BY `a`.`id` ORDER BY `id` DESC) AS zcount


Can you please have a look and help me installing ES 2.02 ?
thanks in advance

Loïc