How to upgrade system
Download the upgrade package, for core upgrade, usually it is very big, not easy to upload via
GUI, you can download to your local computer and then upload to server via
FTP or SFTP, or you can ssh to the server and download to astercc directly
cd /var/www/html/asterCC/data/_cache/
wget http://download1.astercc.org/packages/core/core-2.2-rc2-patch-x86_64.tar.gz
When you upload (or download) the package, refresh the page, you can find the “Upgrade” button
Click the button to perform the upgrade
During the upgrade, please make sure you don't have ongoing calls
tar zxf http://download1.astercc.org/packages/core/core-2.2-rc2-patch-x86_64.tar.gz
cd core-2.2-rc2-patch-x86_64
php install.php