Steps to prepare over the air app deployment without paid apple developer account using Xcode 7:
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Build/Archive the app in Xcode 7
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go to the Xcode organizer window and locate the archive, show in finder.
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use command line to convert the archive into an ipa: xcodebuild -exportArchive -exportFormat ipa -archivePath {FILE_NAME}.xcarchive -exportPath ~/Desktop/{FILE_NAME}.ipa -exportProvisioningProfile {your provisioning profile}