Is development stopped in this forum by owner?
Please post the download link from which you downloaded.
The file name still says: cm-12.1-20150414. is it really the latest V5.1.1 or the old one. Please clarify.
5.1.1 is link is under 5.0.2 section. For your ease - https://www.androidfilehost.com/?fid=96042739161892911...
Flash CM12.1, reboot, finish first setup, reboot into recovery and flash gapps package. Then you will not face with any problems with install wizard.
I flashed Paranoidandroid's latest 5.1 gapps, it comes with Google Messenger. I don't have any S...
MEGA link ask for this "Enter decryption key"
I just downloaded from this link, didn't ask for any key. Try to mega link from few post above.