For some reason your shared host doesn't have the Phar extension, which is required to open PHAR files. It may be using PHP 5.2 or earlier, where Phar was not enabled by default, or it may be disabled by the host for some reason.
If the problem is 5.2, there's no workaround - find a different host with PHP 5.3 or greater.
If the problem is that it's disabled, what you can do is use one of the other two archives - zip or tgz. Extract it, upload the folder to your shared host, and in your project, include the "src/PEAR2/Autoload.php" file instead of the PHAR file.
Or you could contact your host, and ask them to enable the Phar extension and Phar class... Though I find it unlikely for them to enable it on request, as shared hosts are notorious for not doing such things.
Thank you, it was disabled. I managed to enable it from cPanel. For anyone else who has the same issue, here is a screenshot to help
phar.PNG
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