what i did was.
» Install Velvet.apk open it and exit
» Install prebuiltgmscore.apk but it failed
» i now continue with Launcher.apk open it and exit
changed my default launcher to Kitkat UI.
after reboot Google Search updated, Text to speech updated from playstore
then when i tried using the search, Google Search stops working.
tried installing prebuiltgmscore.apk once again, didnt worked, install failed