The All4 app is in the All Apps section on the V6 box and doesn't need downloading.
Using the remote click on HOME > Apps & games > All Apps and it should be there.
You can also force the box to look for missing channels and apps by using your remote control and clicking on
Help & Settings>Help> VirginTV > go up to the top of the screen then TV Care and press OK > Missing Channels.? > Refresh my channels list
Are you sure you haven't got the newer TV360 box? On this box All4, My5 etc are not apps in their own right but content is accessible via the Catch Up menu by selecting from the channel drop down. They should be added further down the road by a software update from VM.
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