Thanks Bob !

I removed and reinstalled FM that was on my system,
I found the .exe in C/Programes Files/FocusMax/
and I registered as you said

I started FM and then ACP (that was the order at that time
But I do not see FM under ACP Autofocus

I connected the focuser from FM (using properties), then try to "jog"
but I get the same error (see below) saying FocusMax.focuser not register. Should I reinstall the focuser driver ?