Yes, once you migrate from the mydlink app to the new mydlink app version 2.00 on one mobile device, it is recommended that you update to the new mydlink app on the rest of your mobile devices.  To ensure that your mydlink devices will continue to work properly with the new mydlink app, the old mydlink app will not allow you to change automation rules, schedules, One-Tap, cloud recording subscriptions and set up a new device. Watching live feeds and footage still remain to work in the old app.