The announcements of the hot fixes for AC18 and AC19 are a bit too ambiguous about their compatibility with El Capitan. The Help Centre post has not been upgraded to give the "All Clear"
If the problems are fixed, can GSHQ please give us an official announcement please.
I cannot move to OS X 10.11 until I see something in writing.
Think Like a Spec Writer
AC4.55 through 27 / USA AC27-6000 USA
Rhino 8 Mac
MacOS 14.6.1