You should check your email INBOX, I replied via email few days ago but here the result
“When I uploaded the folders via ftp, Joomla never found them.”
Did you INSTALL SP Pagebuilder before ?? Just install it and implement our extra add-ons for the Tixo template, by default, Tixo is built with QUIX PAGEBUILDER, not SP Pagebuilder and you need to implement it if you want to use sp page builder instead Quix.