In the Openerp 7 Below download link http://nightly.openerp.com/7.0/nightly/exe/

Each and Every day Setup file will be updates when it will be finalize? and how to maintain latest source code based on updates?

Supposed installed openerp 7 Setup file 01-Apr-2013[openerp-allinone-setup-7.0-20130401-231713.exe] Now i want to update the source code 20-Mar-2013 [openerp-allinone-setup-7.0-20130519-231019.exe] what are the steps need to follows?

How to find out APR-2013 to May-2013 which modules or files code are updated? Are simply uninstall APR-2013 setup and install setup May-2013 it also create problem after 10 days new setup file will be updates.

so how to maintain latest source code? And also how to find difference between source code based on files and modules.