The download is avaialble for registered users of any paid version at:

https://cc.embarcadero.com/item/30837

The iOS-related publicly reported issues addressed by the patch are:

RSP-20268: [DCC Error] E2597 ld: file not found: /usr/lib/system/libcache.dylib for architecture arm64
RSP-20303: XCode 9.3 and iOS 11.3 linker error
RSP-20342: A blank project of Delphi Tokyo 3 Don't compile in iOS
RSP-20346: Compiling error with SDK11.3 for iOS, XCode 9.3

The CodeInsight related issues include:
RSP-16046: [Regression] [Code Completion] Code completion dialog does not show up in overloaded method
RSP-14877: IDE freezes
RSP-17412: Code completion failure
RSP-19856: Code completion failure SY12895
RSP-19508: Code completion