This is a known Joomla issue where components cannot be installed through the browser window. Just download all Joomla components using FTP connection.
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If your site is based on PHP, the most likely cause of the problem is that you missed a symbol...
If you run a job through PHP, for example php -f /home/username/public_html/file.php and you...
You need to add this line to your htaccess file in the directory where you want to disable magic...
This error is generalized when there is a problem the server cannot process a request to the site...
If your account has been hacked, be sure that this is not related to the security of the server....