You need to install SP Page Builder Free/Pro version first
Grab it here https://www.joomshaper.com/downloads/extension/sp-page-builder-free (it requires free account to download, latest version is 3.6.0) or you can download directly here https://www.dropbox.com/s/2slzy40rhpc4kg7/com_sppagebuilder_lite_v3.6.0.zip?dl=0
Next, implement our Extra add-ons 1.1.2 version following this doc http://demo.warptheme.com/joomla/pagebuilder/index.php/documentation#implement
After that, you can see all add-ons via SP Page Builder -> Add addons
In the next update, Tixo, Antique, Factory will ported to Helix ultimate instead Helix 3 and using SP Page Builder 3 instead Quix page builder.
If you still face any problem, please submit a private ticket here https://warptheme.com/member-area/ticket-system/
NOTE: You should fix the issue with full mailbox to receive our email support