Fatel Error updating to Pro

I?ve purchased and paid for Niso Carosel Pro and get the following when trying to install the plugin:

Fatal error: Cannot redeclare niso_cmb2_conditionals_load_actions() (previously declared in /home/mamakeiki/public_html/wp-content/plugins/niso-carousel-slider/admin/src/cmb2/cmb2-conditionals.php:15) in /home/mamakeiki/public_html/wp-content/plugins/niso-carousel-pro/admin/src/cmb2/cmb2-conditionals.php on line 23

Please help.