Apple announced that iOS 13 , which was made public on September 19, reached 50 per cent. In addition, the new mobile operating system has been installed on 55% of all iOS devices launched in the last four years .
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However, 41 percent of iOS devices still use iOS 12 software. Approximately 9 percent have older versions of the operating system installed. The iOS 13 usage rate is increasing at the same speed as the iOS 12 released last year.
There were many bugs in the iOS 13 update released in September. The company then released regular updates that will correct these errors. Apple is also working on the iOS 13.2 release, which is expected to be released in November.
the https://www.macrumors.com/2019/10/16/ios-13-adoptio