Hello,

I tried to install on macOS High Sierra with Homebrew, but got the following error after "make install" :

Error: The brew link step did not complete successfully
The formula built, but is not symlinked into /usr/local

You can try again using:

Does anyone know what to do?

You can try that suggestion, but if that also fails, try brew doctor before you do anything else. That usually comes up with useful suggestions on broken installations.

You can try to make that /usr/local/share/cadabra2/images folder writeable?