I'm installing a J4 envrionment to replace my presetn J3 site.
I have installed 2 components :
without any problem.
When I try to install 'Extension Manager' using 'upload package file' I get nothing. I just receive on my download directory on my computer a copy of the file I try to install.
When I try 'install from Web' if just get the message 'loading...' and nothing more.
How can I install 'Extension manager' on my J4 Site ?