This package is required by some of our add-ons which are coded to work on XenForo 2.1.x - 2.3.x which sometimes have incompatibility in syntax, and cannot execute correctly the shared code. The package is using PHP class aliases to automatically load different classes based on current XenForo version.
Please install the package only if any of our products used on your board require this package.
![[AL] Compatability Layer](/data/resource_icons/0/351.jpg?1733073196){kind=icon}