Installation problem in yureka I cannot click install when selected an app to install in yureka ?( Not in play store,selected through a file manager) I'm sure it is not a touch screen problem.
This is caused by a security feature of Android, to stop third-party apps trying to overlay or hide the permissions information when an app is trying to be installed.

Apps such as Lux, Screen Filter or any other filter/overlay app will prevent you from being able to click the Install button as they are essentially just an overlay, on top of the "Package installer" dialogue screen.

If you disable or turn off the filter whilst installing an app you should be able to click the Install button again. Once clicked you can turn the app back on.