Are you on iOS8? If not no point looking for update.
I can see the App in the App store, do I understand correctly that you don't?

Look under Meridian Audio, Core Control.

Cheers!

Living room: Ansuz Mainz8 C2, Uptone Ethernet Regen, Grimm MU1, Audionote (UK) DAC 5 Special, TT2, M2RIAA, Audionote (UK) OTO Line SE Signature, Fleetwood Deville SQ
sold (Q1-2024): 818v3, DSP7200SE
Office: MS200, audio engine A2+
Spare: STAX SRM-323II, SR303, MC200 (Roon ROCK’ed),
Roon: life time subscription