www.hikashop.com/support/documentation/5...html#display_general
Popup mode: The default value is inherit. In that case, HikaShop will use the mootools popup system of Joomla 1.5 and 2.5, and on Joomla 3.0, it will use the responsive popups of bootstrap (a library in Joomla). If you have display issues with the popups on Joomla 3.0, you should select "mootools" in order to go back to the popup system of mootools which is still in Joomla 3.0 but not used by default.
Cette option est dans toutes les versions : Starter, Essential et Business.
Vous aviez donc ce soucis également. Sauf si vous avez changer la configuration entre temps. Mais il n'y a rien eu de changé et cette option existe depuis Hikashop 2.1.0
Cordialement,