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David TolpiDavid Tolpi 

Upgrade to Winter 2016 Developer edition

How do I upgrade my developer edition to the latest Developer edition without using a new email address?  I am trying to do the trailheads, but my layout is different than what it being presented.   For example, the Setup is beneath my name, not to the side, and the 'create custom buttons' is different as well.  
Thanks!
Anuj PatelAnuj Patel
Based on your description, I thing you want to enable Lightning Experiance. Please go to the follwoing link that will help you to understand the enabling process.

https://developer.salesforce.com/trailhead/en/lex_migration_introduction/lex_migration_introduction_administration



Please mark it as the best answer if you find it useful.

Thanks,
Anuj.