Have I read the related troubleshooter articles above before posting (which pages?)? Yes - search on upgrade
Have I searched the tickets before posting? yes - searched on 2.5 fails to update
Have I read the documentation before posting (which pages?)? yes -installation
Joomla! version: 2.5.4
PHP version: 5.3.9
MySQL version: 5.1.56
Host: Rochen
Admin Tools version: 2.2
Description of my issue:
Attempting to upgrade to the new version - Using the Admintools component - clicking on the upgrade button - returns an error message "Unable to open archive
Extracting the update package failed. Please try updating the extension manually."