Using an SSH client (i.e. Putty), you can manually install Magento. Below we have shown the basic steps necessary to complete the download process.
1. wget http://www.magentocommerce.com/downloads/assets/1.8.1.0/magento-1.8.1.0.tar.gz
2. tar-zxvf magento-1.8.1.0.tar.gz
3. mv . magento/ * magento/.htaccess
4. chmod -R 777 media var app/etc
Optionally, you can delete the downloaded file and empty folder from the extracted files:
5. rm-rf magento / magento-1.8.1.0.tar.gz
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