Good news :-)
Abook 4 is out. This version is compatible with Joomla 4.X versions.
Download it HERE .
Have an happy upgrade and nice holiday!
Abook 4 is out!
Donate
A financial contribution is greatly appreciated as a support, to help us to keep live the project.
Donate 
Abook versions
4.0.5 for J4 and J5 (Current versionBeta)