Project:Sandbox

Overview
Starting with version 1.6, there are three ways to update your Joomla Website to versions 1.6, 1.7 or 2.5. Each of these is discussed below.
 * Extension Manager: Update
 * Extension Manager: Install
 * Manually Copy Program Files

Documentation of plan Overview (why)
Updating to the latest Joomla version and transfer info images, graphics, and templates from old site to new one Tuesday June 25 - July 3 2012

Requirements
what to check of the enviroment server php jooomla version etc

Backup (everything)

 * SQL Raw (export)
 * Site data (backup site folder on server)

Start Update process
running a site with Joomla version 1.6.0 to 1.6.4, you can still use the Extension Manager → Update to update your site. However, in this case you will need to go through the update process two times. The steps are as follows:
 * Navigate to Extension Manager → Update in the back end of the site and click on the Update tab.
 * Click the Find Updates button. The update for the latest Joomla Version should show.
 * Check the box for the Joomla update and click on the Update button. The system will work for a minute or two.
 * At this point, you may be presented with a blank screen. This is expected behavior. Now, you can either:
 * 1) Press the Reload button on the browser to initiate the second update.
 * 2) Or change the URL to administrator/index.php?option=com_installer to reload the installer page. In this case, navigate back to the Update tab, check the box for the Joomla update and press the Update button again.
 * The system will again work for a minute or two and then show the success message "Updating file was successful".

Clear the Cache
the javascript libraries and css have been updated and this can effect both the admin and frontend of your site giving some unpredictable effects. To resolve this you need to clear your web browser cache (not joomla cache) and reload the page. This ensures that things like modal boxes and checkboxes are working correctly.

Check for databases fixes
in Joomla In some circumstances the one-click upgrade is not able to apply the small database changes. But don't worry Joomla can resolve this easily. All you have to do is click on the Database tab in the Extension Manager and the changes will be applied.

Check Plug-ins and Modules updates
sometimes some of the new plugins and modules will not be available in your control panel. The database fixes should resolve that but I always think it is better to be safe and not to assume anything. Go to the Discover tab in the Extension Manager. Click on Purge Cache on the toolbar and then click Discover. If any new extensions are listed you should tick them all and then click on Install. Note if their were any plugins discovered then they will probably be installed as "disabled" and you will need to go to the plugin manager to enable them if required.

Purge Cache /Check updates/ Discover and install
in extension manager sometimes some of the new

Check Global Configurations
admin (back end) and Front end (website) On many sites people are using scripts to disable Mootools from loading on the frontend of their site. This may have been done by an option in the template or via a plugin. Due to a change in the way captions.js is loaded on the front end of your site if you are not loading mootools then other javascript may fail. IF you observe weirdness on the front end of your site andyou have already cleared your browser cache and joomla cache then re-enabling mootools will resolve this.