Install xcode 4 on OS X Yosemite - ios

Question

I need to install old version of Xcode on Yosemite. Xcode 5 installed perfectly but I am facing problem with Xcode 4. It crashes, these are the errors:
Process: Xcode [4341]
Path: /Applications/Xcode 3.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 4.6.3 (2068)
Build Info: IDEApplication-2068000000000000~3
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [4341]
User ID: 501
OS Version: Mac OS X 10.10 (14A389)
Report Version: 11
Anonymous UUID: 5F18251C-5B88-768B-7023-12B7B510FD63
Time Awake Since Boot: 13000 seconds
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
ProductBuildVersion: 4H1503
UNCAUGHT EXCEPTION (NSInternalInconsistencyException): Error getting value for key 'delegateClass' of extension 'Xcode.OrganizerSource.ArchivedApplications.ArchiveListContextualMenu' in plug-in 'com.apple.dt.IDE.IDEArchivedApplicationsViewer'
UserInfo: {
NSUnderlyingError = "Error Domain=DVTPlugInErrorDomain Code=2 \"Loading a plug-in failed.\" UserInfo=0x4016afbe0 {DVTPlugInIdentifierErrorKey=com.apple.dt.IDE.IDEiPhoneSupport, DVTPlugInExecutablePathErrorKey=/Applications/Xcode 3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/PrivatePlugIns/IDEiPhoneSupport.ideplugin/Contents/MacOS/IDEiPhoneSupport, NSLocalizedRecoverySuggestion=The plug-in or one of its prerequisite plug-ins may be missing or damaged and may need to be reinstalled., NSLocalizedDescription=Loading a plug-in failed., NSFilePath=/Applications/Xcode 3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/PrivatePlugIns/IDEiPhoneSupport.ideplugin, NSLocalizedFailureReason=The plug-in \U201ccom.apple.dt.IDE.IDEiPhoneSupport\U201d at path \U201c/Applications/Xcode 3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/PrivatePlugIns/IDEiPhoneSupport.ideplugin\U201d could not be loaded. The plug-in or one of its prerequisite plug-ins may be missing or damaged., NSUnderlyingError=0x40033a480 \"The bundle \U201cIDEiPhoneSupport\U201d couldn\U2019t be loaded because it is damaged or missing necessary resources.\"}";
}
Hints: None
Backtrace:
0 0x00007fff97fe3634 __exceptionPreprocess (in CoreFoundation)
1 0x00007fff8db0c6de objc_exception_throw (in libobjc.A.dylib)
2 0x0000000106012e16 -[DVTExtension valueForKey:] (in DVTFoundation)
ect....

Answer 1

Instead of trying to run Xcode 4, I suggest you run Xcode 5 or 6 but install the iOS 6 SDK so you can compile your iOS 6 SDK app on Xcode 5 or 6.
Be aware that Apple will not accept any app submission with SDK < 8 after February 2015. Apps also need to be 64-bit as well (of course, you're still allowed to ship a dual 32-bit/64-bit app).