SL Remote requires a 64bit setup.
Chances are your iPad is now longer compatible.
QMix and SL Remote for Classic StudioLive 16.4.2, StudioLive 24.4.2 and StudioLive 16.0.2 have been updated to 64-Bit for support of iOS 11. Be aware that once Qmix and SL Remote have been updated, they can not be reverted to previous versions. The older 32-bit applications are also no longer available, since as of iOS 11 Apple has removed support for 32-bit applications from their webstore.