How to install BOINC client/manager?

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http://askubuntu.com – I am trying to install the BOINC client/manager which is a .sh file, so I can contribute to the world community grid. I installed the version that is in the Software Centre, but it is 2 versions behind, so I was wondering how I can install the current version (which I have downloaded to my computer) Any help would be great. (HowTos)