If you are upgrading Magento using download manager to version 126.96.36.199 and getting below conflict errors then follow below 2 solutions.
Package community/Interface_Adminhtml_Default 188.8.131.52 conflicts with: community/Mage_All_Latest 184.108.40.206
Package community/Interface_Frontend_Default 220.127.116.11 conflicts with: community/Mage_All_Latest 18.104.22.168
Package community/Interface_Install_Default 22.214.171.124 conflicts with: community/Mage_All_Latest 126.96.36.199
Please delete file from root directory of magento /pkginfo/Mage_All_Latest.txt and try again with upgrade to version 188.8.131.52.
Open Magento Root Directory/downloader/lib/Mage/HTTP/Client/Curl.php
Find below text and comment it.
Insert below code after commented line