Magento 1.9.2 Unknown cipher in list: TLSv1

For

"CENTOS PHP 5.4.43 cURL 7.19.7"

In downloader/lib/Mage/HTTP/Client/Curl.php, try changing:

$this->curlOption(CURLOPT_SSL_CIPHER_LIST, 'TLSv1');

to

$this->curlOption(CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);