There may be some reasons preventing the installation of your apps ! If they are built-in, please check my other post how to install a modded application.
1) Download and install Lucky patcher here and never from playstore (https://lucky-patcher.netbew.com/download/)
2) Open Lucky Patcher from the app drawer and let it refresh
3) Click “Toolbox” (pict.1)
4) Click “Patch to android (pict.2)
5) Check “Signature Verification status always true” and “Disable .apk Signature Verfication” and click Apply. (pict.3)
6) Your device will reboot or not reboot. Depending from device to device!
7) If not, just click OK
8) Reboot your device
9) Now Install your Hello Kitty Facebook/Messenger