Update package in Ubuntu [closed]

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I just installed the envisag 3.x plugin from the Ubuntu Software Center, My question is, how can I update this to envisage 4.x.

I'm using python 2.6 and Ubuntu 10.04 LTS 64bit

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For Ubuntu packages, it may not be the latest version for 2 reasons:

1. dependencies availability: the dependencies version required is not available in Ubuntu yet
2. stability: latest version may not be the most stable version, therefore the most stable version is picked by Ubuntu

To manually update certain package to your desired version ( either upgrade / downgrade ), remove the version that comes along with Ubuntu, and download from developer. Follow the instructions to install the package. However, through this method, the package cannot update through apt-get.