How to remove "Your Odoo is not supported. Upgrade now or register your contract here"? That is, without actually registering a contract with OpenERP SA.
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Download oerp_no_phoning_home and place it in one of your addons directories
`git clone https://bitbucket.org/BizzAppDev/oerp_no_phoning_home.git`
You can set it up like this:
For OpenERP v7 there's also this addon: https://www.odoo.com/apps/7.0/web_adblock/
As of Odoo 8.08 you may have to try this: http://odoo.guide/debranding-odoo-backend/