There is a Google+ update available on https://play.google.com/store/apps/details?id=com.google.android.apps.plus but it's not installable because Android is throwing a error "Package file is invalid".
I tried to uninstall Google+ with success but when i want to install Google+ from play I got "Package file is invalid" error again. So now I can't use Google+ app because I've got problems to install it.