cannot uninstall extension pack

[neuronetv]

I'm running virtualbox 4.3.12 on centos 6.5 server, command line only. This is a new install of virtualbox and I made the mistake of installing 'Oracle_VM_VirtualBox_Extension_Pack-4.2.12-84980.vbox-extpack, which the console says is unusable

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# VBoxManage list extpacks
Extension Packs: 1
Pack no. 0:   Oracle VM VirtualBox Extension Pack
Version:      4.2.12
Revision:     84980
Edition:
Description:  USB 2.0 Host Controller, VirtualBox RDP, PXE ROM with E1000 support.
VRDE Module:  VBoxVRDP
Usable:       false
Why unusable: VBoxExtPackRegister returned VERR_VERSION_MISMATCH, pReg=0000000000000000 ErrInfo='VirtualBox version mismatch - expected 4.2 got 4.3'

Problem is I can't upgrade it or uninstall it. If I try to install /Oracle_VM_VirtualBox_Extension_Pack-4.3.14-95030.vbox-extpack I get:

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# VBoxManage extpack install ./Oracle_VM_VirtualBox_Extension_Pack-4.3.14-95030.vbox-extpack
0%...
Progress state: NS_ERROR_FAILURE
VBoxManage: error: Failed to install "/home/packages/./Oracle_VM_VirtualBox_Extension_Pack-4.3.14-95030.vbox-extpack"
VBoxManage: error: Extension pack 'Oracle VM VirtualBox Extension Pack' is already installed. In case of a reinstallation, please uninstall it first
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ExtPackManager, interface IExtPackManager
VBoxManage: error: Context: "int handleExtPack(HandlerArg*)" at line 1143 of file VBoxManageMisc.cpp

and when I try to uninstall the 4.2.12 I get:

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# VBoxManage extpack uninstall ./Oracle_VM_VirtualBox_Extension_Pack-4.2.12-84980.vbox-extpack
0%...
Progress state: NS_ERROR_FAILURE
VBoxManage: error: Failed to uninstall "./Oracle_VM_VirtualBox_Extension_Pack-4.2.12-84980.vbox-extpack"
VBoxManage: error: Invalid extension pack name specified
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ExtPackManager, interface IExtPackManager
VBoxManage: error: Context: "int handleExtPack(HandlerArg*)" at line 1183 of file VBoxManageMisc.cpp

I tried:

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# vboxmanage extpack cleanup
Successfully performed extension pack cleanup

but then the extpack still won't uninstall, it keeps throwing the same error as before. Help please this is driving me nuts.

[neuronetv]

typical eh? 5mins after posting this I found the solution so I'll share it here for others' benefit:
To upgrade the extpack one needs '--replace' in the command. What worked was:

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# VBoxManage extpack install --replace ./Oracle_VM_VirtualBox_Extension_Pack-4.3.14-95030.vbox-extpack
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Successfully installed "Oracle VM VirtualBox Extension Pack".

and then

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# VBoxManage list extpacks
Extension Packs: 1
Pack no. 0:   Oracle VM VirtualBox Extension Pack
Version:      4.3.14
Revision:     95030
Edition:
Description:  USB 2.0 Host Controller, Host Webcam, VirtualBox RDP, PXE ROM with E1000 support.
VRDE Module:  VBoxVRDP
Usable:       true