I Was In Minecraft 1.12.2 And I Wanted To Play The Snapshot 18w16a..

There's A Problem With Me Opening The 18w16a Snapshot.. I Was Tired Of 1.12.2 Because Its Old.. When I Got To The Launcher Menu I Pressed Play And It Didn't Work.. I Can Only Access To 1.12.2 No The New Snapshots.. Please Fix It.

I Play Cracked MC