However, my prior RTC version 9.21 did let me compile 64-bit.
If we look at the 9.21 code for rtcSDK.dproj we'll see the following:
<Platforms>
<Platform value="Android">False</Platform>
<Platform value="iOSDevice32">False</Platform>
<Platform value="iOSDevice64">True</Platform>
<Platform value="iOSSimulator">False</Platform>
<Platform value="Win32">True</Platform>
<Platform value="Win64">True</Platform>
</Platforms>
...that shows Win32, Win64, and iOSDevice64 are all True.
However, if we look at the same code for 9.5, it shows the following:
<Platforms>
<Platform value="Android">False</Platform>
<Platform value="iOSDevice32">False</Platform>
<Platform value="iOSDevice64">True</Platform>
<Platform value="iOSSimulator">False</Platform>
<Platform value="Linux64">False</Platform>
<Platform value="OSX32">False</Platform>
<Platform value="Win32">True</Platform>
<Platform value="Win64">False</Platform>
</Platforms>
...that shows only Win32 and iOSDevice64 set to True.
Thanks.