Thanks for the answer. Ok, got the point and no chance to use v7.0 for this module. But is it really this easy (as per the link you provided above): $sudo apt-get install bzr $sudo su - openerp $cd /opt/openerp $bzr branch lp:openobject-server/7.0 server $bzr branch lp:openobject-addons/7.0 addons $bzr branch lp:openerp-web/7.0 web

And further, above commands refer to v7, they should be changed to v8? And still, how about the existing v7 database 'migration' to the v8, is there any actions reaquired in case you have standard v7 without any own modules. How are all the cahnged configurations, master data and documents (sales orders, purchase orders etc.) available in v8 after above?

What about updating to v8 from nightly packages by updating "sources.list" file? After this $sudo apt-get update $sudo apt-get install openerp Would this do the same or what's the difference? What would happen to the v7 installation?

You should try.... I think you need to understand the migrations strategy. (as usually). So you have to create a plan when you write down step by step the actions. (If you have a live system, you have a huge problem, if you do not understand the openerp system as well.) Models, db, work-flows, views, and so on. So generally very hard to answer your question...