建議用 5.5.1 ，功能差不了太多，要不就得自己在32位系統下從源碼編譯Qt了。
posited inside a XAML layer, allowing for better integration with the native UI layerWindows embedded
Added support for WEC2013
Qt WebView
Added support for WinRT
Qt Canvas3D
Support for using Qt Quick items as textures
Support for rendering directly to Qt Quick scene background or foreground
Qt Nfc
Added support for Android
Qt Positioning
Added support for OS X
Added support for GPS receivers exposed as a serial port on Windows desktop (all versions)
Removed libgeoclue dependency for the GeoClue backend
Qt Location
Added the Qt Location module providing maps, navigation and places APIs for Qt Quick
Other Changes
Embedded platforms
libinput, when present, is now the default for eglfs and linuxfb
Image Formats
For security reasons, the MNG and JPEG 2000 handlers will by default no longer be built, unless the corresponding codec libraries are provided by the OS. Hence, the binary Qt releases for Windows and Mac will not contain prebuilt handlers for those formats, but users can still build them from source.
Deprecated Modules
The following modules are part of Qt 5.6 release, but deprecated and considered for removal in subsequent releases of Qt:
Qt Script
Qt Enginio
Removed Modules
With Qt 5.6 the following modules are no longer part of the release packages, but users can still build them from source:
Qt WebKit
Qt Declarative (Qt Quick 1)