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I downloaded the starter files but my new version of XCode(11) is incompatible with swift version 3.
unable to run the app, build keeps failing due to incompatible version of Xcode
After you click okay on the Unsupported Swift Version dialog box, from the project explorer (folder icon on the left) click the topmost project file. Go to Build Settings, under the Swift Compiler - Language section change it to Swift 4 or later. When you change the version, some errors and warnings due to code depreciation, you will need to address them. First, select the Warning Icon from the toolbar on the left (same row as the folder icon earlier). Choose update recommended settings and perform changes. Then select Migrate "ProjectName.xcode" and then Migrate from the dialog box which appears. You should be good to go after this. Again there will be some warnings and errors for depreciated code.