ZOO Essential Addons
Specifications

Addon	State	Compatibility
Core 1.x	Stable	Joomla 3 / ZOO 3 / Widgetkit 2
Core 2.x	Stable	Joomla 3 & 4 / ZOO 4 / Widgetkit 2 & 3 / YOOtheme Pro
Filter 3.x	Stable	Joomla 3 / ZOO 3
Filter 4.x	Merged in Core 2.x	Joomla 3 & 4 / ZOO 4 / YOOtheme Pro
Lingual 3.x	Stable	Joomla 3 / ZOO 3
Lingual 4.x	Merged in Core 2.x	Joomla 3 & 4 / ZOO 4
Cart	Discontinued	Joomla 3 / ZOO 3
Events	Discontinued	Joomla 3 / ZOO 3
Compare	Discontinued	Joomla 3 / ZOO 3
AcyMailing Bridge	Discontinued	Joomla 3 / ZOO 3
ZOOorder	Discontinued	Joomla 3 / ZOO 3

If you are about to upgrade to ZOO 4, assure that all required addons are compatible as mixing versions is not possible.