I have upgraded a magento website from 1.7x to 1.9x. I found many issues but one of them is pretty serious. I have copied the app/code/community folder from the old to the latest version. Now the problem is I cannot see those extension on my Magento Connect Manager. Neither I can install those extensions nor I can update those.
Please guide me as to what is the best way to get the extensions show up? What is the best way to upgrade infact.