I)Refresh the sandbox after the sandbox preview starts. II)Make sure the sandbox is on a preview instance before the sandbox preview cut-off date. III)Request an upgrade from support and provide your instance ID. IV)Buy some sand, wood planks, and a shovel to build a sandbox yourself. [bg_collapse view="button-orange" color="#4a4949" expand_text="Show Answers" collapse_text="Close Answer" ] II)Make sure the sandbox is on a preview instance before the sandbox preview cut-off date. [/bg_collapse]