You may be interested in knowing that Vuforia 4.0 Beta with iOS 64bit (arm64) support was announced yesterday:

https://developer.vuforia.com/forum/vuforia-40-beta/ios-64-bit-support-now-available-vuforia-40-beta

Ok, thanks for sharing these tips; as you said, you are probably not the only one, so yes, your post will certainly be helpful to other developers as well.

Ok so on my machine, for whatever reason, the only architechture available is ARCHS_STANDARD. Editing this setting and adding your own doesn't work, and it won't "copy down" settings from the main line to the two under it (you'll see what I mean below). I suspect I'm not the only one, so you might want to put this into the FAQ:

1) Open the project settings page (click on the project name in the file navigator) and select the Build Settings tab

2) Click on the triangle beside the Architechtures line

3) Click on up.down arrow on the left of the Debug line, and select Other... in the pop-up menu that appears

4) Double-click the architechture line to edit it, change it from "ARCHS_STANDARD" to "ARCHS_STANDARD_32_BIT"

5) repeat steps (4) and (5) for the Release line as well

You can build your app with the 32 bit target, also on iPhone 5S, see this thread:

http://stackoverflow.com/questions/19011973/xcode-5-ios7-and-64bit-vs-32bit