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Umang DesaiUmang Desai 

Lightning App Builder not available to complete Trailhead challenge

How can i get Lightning App Builder enabled for my developer org (Org Id: 00D24000000d8Vb?)
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Sign up for a new dev org:

https://developer.salesforce.com/signup_lightningweek?d=70130000000NFKf

https://developer.salesforce.com/trailhead/project/quickstart-app-builder/quickstart-app-builder1