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But iPhone 6 can still download whatever version supported by the latest iOS version on the phone, right?

• fg137 6mo ago
  That catalog is diminishing if not almost completely gone. Even if an app exists, unless it is (mostly) local, chances are that it's so old that it cannot talk to the remote server using the correct API. For mainstream apps, if it launches at all, many will immediately tell you to upgrade to a newer version otherwise it won't work.