How to migrate from version 9.12.4 to 9.15.0

Hi Experts, I had build a mendix app on version 9.12.4 but when I started using another version 9.15.0 and when I opened the app, covert the app in another version option appeared to me as I open the app but when the conversion happen no files where there in the app? HOw can I bring all the files build in version 9.12.4 to version 9.15.0? please help me
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