Fatal error, won't activate the plugin

I had installed it before, and deactivated and deleted it. Also have Members plugin and Profile Builder plugin as well as Gravity Forms installed. Need a registration plugin that handles custom roles and recaptcha for free because GF’s registration module would conflict. So need Ultimate Member but it won’t activate now! Any ideas?

Fatal error: Call to undefined method Redux_Helpers::isTheme() in /home/billstre/public_html/wp-content/plugins/ultimate-member/admin/core/um-admin-redux.php on line 19

https://ww.wp.xz.cn/plugins/ultimate-member/