I have not found the SlicerANTs extension in the extension manager (I use Slicer 4.11 version), Furthermore, when I install it via GitHub I cannot find it anywhere among extensions.
Do you have any idea how to solve this issue?
SlicerAnts is not available for the latest stable release (Slicer 4.11.20210226). You will have to use the latest Slicer Preview release which you can download from https://download.slicer.org/. Using this latest version you will be able to install SlicerAnts from the Extensions Manager.
Thanks for the info. I have solved the problem by updating to the latest version.