Please see below a run-down of Novation product compatibility with El Capitan as it currently stands.
Current Launchpad family (Launchpad Pro, Launchpad MK 2 (with RGB pads))
Works with El Capitan? YES
Launchkey MK 2 (green base)
Works with El Capitan? YES
MK 1 Launch family (Launchpad S, Launchpad Mini, LaunchKey MK 1 (orange base), LaunchKey Mini, Launch Control, Launch Control XL)
Works with El Capitan? YES
Audiohub 2x4
Works with El Capitan? YES
Points of note: Audiohub will only work with Cubase 8 when both the interface and the DAW are set to either 44.1kHz or 48kHz before opening Cubase. If either (or both) are set to 88.2kHz or 96kHz, the Audiohub will be selectable, but no audio will pass into or out from the DAW. We are working with Steinberg to resolve this issue and hope to have a resolution shortly.
SL MkII
Works with El Capitan? YES
Impulse
Works with El Capitan? YES
UltraNova
Works with El Capitan? Please contact Tech Support as there are resolvable known issues
MiniNova
Works with El Capitan? YES
Bass Station II
Works with El Capitan? YES
Dicer
Works with El Capitan? YES
Automap
Works with El Capitan? YES
B-Station plug-in
Works with El Capitan? YES
V-Station plug-in
Works with El Capitan? YES
If your product is not listed, it is not officially supported with OSX El Capitan, you can find full details on our support policy here.