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After upgrade, downloadable product links no longer work.
I recently followed a guide to update from 126.96.36.199 to 1.8.1. After the upgrade the admin panel Configuration window shows an empty white page and the download link for downloadable products just shows the home screen with no download or error.
I enabled error messages in index.php and the configuration tab shows this error
Fatal error: Class 'Mage_Awall_Helper_Data' not found in /html/app/Mage.php on line 547
Any help at all is greatly appreciated, thank you!