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The upgrade process might fail due to objective reasons. Below you can find the a detailed description of each possible case.


Magento Connect requires writing permissions to Magento files in order to install new extensions or to upgrade an existing extension to the latest version. If Extension is installed and then the permissions on a file system are changed (i.e. from ‘write’ to ‘read’), Magento Connect Manager will fail to copy the latest files from an archived package to Magento Installation folder.