Итак, я увидел этот пост:http://mobiledevelopertips.com/xcode/download-and-install-older-versions-of-xcode-xcode-previous-releases.html

о загрузке старых версий Xcode. До сих пор я всегда загружал новейшую версию Xcode из App Store и позволял ей делать свое дело. Недавно на одном компьютере, на котором установлен Xcode 4.5, я заметил, что если я создаю новый проект, я получаю только симуляторы iOS 6.0, а не 5.0 или 5.1.

My first question is, do I need older versions of Xcode to build apps for older OS (e.g. iOS 4, iOS 5.0, 5.1, etc)?

If so, what's the best way of installing these older versions of Xcode. I see that they have the command line tools to download as well. I'm not sure how all that stuff works.

What's the best way to update to the latest Xcode but keeping the old Xcode around? On a different machine that had Xcode 4.4.1 installed, I thought I could download Xcode 4.5 from the ADC website and install it. I downloaded it, double-clicked on the .dmg, then double-clicked on the Xcode file. This then installed Xcode 4.5 without asking me where I wanted it installed so I could keep the older version of Xcode (assuming that I need it as stated in my 1st question).

Спасибо!