Essentials ZOO
Specifications

AddonStateCompatibility
Core 1.x
Stable
Joomla 3 / ZOO 3 / Widgetkit 2
Core 2.x
Beta
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 3.x
Discontinued
Joomla 3 / ZOO 3
Events 3.x
Discontinued
Joomla 3 / ZOO 3
Compare 3.x
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. At the moment Cart, Events and Compare are not going to get a ZOO 4 or Joomla 4 compatible version.