[Samsung Gear 2] nrosier:
This is the log when I click install Messenger:

04-04 22:08:48.976 1581 2213 I ActivityManager: START u0 {act=com.google.android.clockwork.home.LAUNCH_PLAY_STORE_ACTION cmp=com.google.android.wearable.app/com.google.android.clockwork.home.RemoteActionConfirmationActivity (has extras)} from uid 10046 on display 0
04-04 22:08:49.078 18919 18919 W RemoteActionActivity: Finishing with failure: reason=Failed: no payload to send; messageId=0
04-04 22:08:49.079 18919 18919 D AndroidRuntime: Shutting down VM
04-04 22:08:49.080 18919 18919 E AndroidRuntime: FATAL EXCEPTION: main
04-04 22:08:49.080 18919 18919 E AndroidRuntime: Process: com.google.android.wearable.app, PID: 18919
04-04 22:08:49.080 18919 18919 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.google.android.wearable.app/com.google.android.clockwork.home.RemoteActionConfirmationActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.clockwork.home.tts.TtsController com.google.android.clockwork.home.tts.A11yPlaybackConnection.getController()' on a null object reference
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.app.ActivityThread.-wrap11(ActivityThread.java)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.os.Handler.dispatchMessage(Handler.java:102)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.os.Looper.loop(Looper.java:148)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.app.ActivityThread.main(ActivityThread.java:5422)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at java.lang.reflect.Method.invoke(Native Method)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-04 22:08:49.080 18919 18919 E AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.clockwork.home.tts.TtsController com.google.android.clockwork.home.tts.A11yPlaybackConnection.getController()' on a null object reference
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at com.google.android.clockwork.home.RemoteActionConfirmationActivity.finishWithResult(RemoteActionConfirmationActivity.java:216)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at com.google.android.clockwork.home.RemoteActionConfirmationActivity.finishWithResult(RemoteActionConfirmationActivity.java:191)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at com.google.android.clockwork.home.RemoteActionConfirmationActivity.onCreate(RemoteActionConfirmationActivity.java:121)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.app.Activity.performCreate(Activity.java:6251)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
04-04 22:08:49.080 18919 18919 E AndroidRuntime:	... 9 more
04-04 22:08:49.083 1581 3308 W ActivityManager: Force finishing activity com.google.android.wearable.app/com.google.android.clockwork.home.HomeActivity
04-04 22:08:49.085 1581 3308 W ActivityManager: Force finishing activity com.google.android.wearable.app/com.google.android.clockwork.home.RemoteActionConfirmationActivity
04-04 22:08:49.131 1581 4296 W InputMethodManagerService: Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@8c716e5 attribute=null, token = android.os.BinderProxy@b2034f1
04-04 22:08:49.131 1581 3308 W ActivityManager: Force finishing activity com.google.android.apps.messaging/.StandaloneModeInstallActionPromptActivity
04-04 22:08:49.175 6912 9077 D OpenGLRenderer: endAllStagingAnimators on 0x42ee7ec8 (RippleDrawable) with handle 0x4d249d08
04-04 22:08:49.187 1371 1371 W SurfaceFlinger: couldn't log to binary event log: overflow.
04-04 22:08:49.207 1581 1592 I art : Background sticky concurrent mark sweep GC freed 15869(1116KB) AllocSpace objects, 6(212KB) LOS objects, 12% free, 12MB/13MB, paused 6.733ms total 113.529ms

Maybe this points someone in the right direction to fix this.