Attached is the full launcher log. The Game Output read: Error: Could not find or load main class net.minecraft.client.main.Main
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
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Edit your profile and select "Use Version: snapshot 1.9". For some reason it thinks the most recent version isn't 1.9, acting like it's still in snapshot. This will at least get you working until Mojang implements a fix.

duplicate of MC-99398