after i upgrade
i go to admin panel ----> system ---->magento conntect mager
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
what i need upgrde if only mage_all_latest version ?
var/log/system.log and var/log/exception.log (if exists) files should give you pretty good idea what's going on. Also did you flush caches and reindex database?
If there is no var/log folder. Then your permissions are not set correctly.
If your permissions are not set correctly in var, you will run into issues. Especially with caching. I would examine all your sites permissions.
Here is a article to help you out. https://blog.nexcess.net/2010/12/06/securing-magento-file-directory-permissions/
In my opinion, I would personally not use Magento Connect to upgrade your Magento Instance. I would personally do it through version control as you will be able to have more control of your code.
By default Magento logging is turned off. Go to "System" > "Advanced | "Developer" > "Log Settings" and enable logging first. Magento logs contain all kind of important and useful stuff. Consult with them before you do anything else.