I want to upgrade my magento site from version 220.127.116.11 to version 18.104.22.168 but I am unable to upgrade through Magento Connect Manager.
When I paste “magento-core/Mage_All_Latest” in the “Paste extension key to install” field and hit the “Install” button then message is appearing “INVALID POST DATA”.
Also, when I hit “Check for Upgrades” button then it does not show any available updates.
I have tried several times but same problem is appearing.
Please help me to resolve this issue asap.