I tested the installers for Linux (64bit and Android), and for Mac (desktop and iOS).
The multimedia module is not installed by default for the iOS platform (device and simulator), while it is installed in all other platforms.
I don't know if this is intended or not. But I'm wondering why it's missing and if it will miss also in the final 5.2.0 release.
Is there any other bugs that blocks the correct compilation of multimedia on iOS ??