Unfortunately, since May 10, 2017, Apple prevents any upload to the Store of a Swift 2 application.
The message is clear:
"ITMS-90473: Invalid Swift Support - The expected directory SwiftSupport was not found in the IPA at the expected path."
This means that all apps compiled with the legacy Swift 2 compiler can no longer be submitted. Apple requires a minimum of Swift 3 for any new submission.
What does this mean for your project?
If your application was developed in Swift 2, you need to migrate to Swift 3 (or later) before submitting any update.
This migration is not always straightforward: many APIs have changed, and depending on the size of your project, it can take from a few hours to several days.
Our recommendation
We strongly recommend migrating as soon as possible. The longer you wait, the more dependencies will become outdated and the harder the migration will be.
At No Limit Development, we support our clients throughout this type of migration. Don't hesitate to contact us if you need help!