Updates includes:
VMM: more work on improving the emulation of certain MSR registers on certain host CPUs (e.g. bugs #12734, #12736, #12744, #12748, #12686, #12770).
VMM: fixed single-stepping for real-mode guests (VT-x without unrestricted guest execution) and some I/O instructions (bug #12636).
VMM: fixed a potential problem with COW pages if nested paging is not available.
GUI: Mac OS X: experimental native full screen support for Mountain Lion and Mavericks (bug #12292).
GUI: Mac OS X: removed the mini-toolbar minimize button which doesn’t work under Mac OS X full screen mode anyway.
GUI: experimental HID LEDs synchronization for Windows and Mac OS X hosts: fixed keyboard re-synchronization if the feature is disabled (as done by default; bug #12758).
GUI: fixed a potential crash when opening the preferences menu (bug #12862).
OVF: fixed a crash of the VirtualBox Manager when re-starting guest export (bug #12586).
3D support: several fixes.
HGCM: fixed a problem with saved states which could cause several guest misbehavior after a VM was started from a saved state.
VBoxSVC: fixed a segmentation fault on Linux hosts if a very long path exists under /dev (bug #12760).
Storage: fixed a bug preventing to compact differential snapshots under certain conditions.
API: fixed guest misbehavior under certain conditions if a storage medium was attached or removed at VM runtime.
Mac OS X Networking: prevent local traffic (VM-to/from-host) from leaking to wire (bug #12750).
Windows installer: make the –silent parameter work again (bug #12764).
Windows Additions: fixed the environment for guest processes (4.3.8 regression; bug #12782).
Windows Additions/WDDM: fixed divide by zero exception with multiple guest screens under certain conditions.
X11 Additions: fix for the VBoxClient process not exiting correctly (bug #12348) and consuming too much processor tim.
Linux Additions: install correctly on Ubuntu guest systems with a /usr/lib64 directory (bug #12513).

download link:

https://usersdrive.com/gll3bnelzesn.html