Hi Mederic,
It sounds like you're trying to install the matlab runtime and the popup shows up but nothing actually happens with the install. Are there any more details you can provide, like any output in the terminal?
Here is a related Answer with some possible suggestions, see if any of these fix your issue:
- https://www.mathworks.com/matlabcentral/answers/229857-why-do-i-see-preparing-installation-files-installing-finished-in-the-terminal-window-wh
