If the normal installation fails, you can try using the install from directory feature of Joomla.
Before doing anything else, you have to extract the installation ZIP file in a subdirectory named bfsurvey on your local PC. Then, upload the entire subdirectory inside your site's temporary directory (usually /tmp).
Click on Extensions, Manage link on the top menu. If you are on Joomla! 3.x please click on the Install from Directory tab. Locate the Install Directory edit box. It is already filled in with the absolute path to your temporary directory, for example /var/www/joomla/tmp. Please append /bfsurvey to it. In our example, it should look something like /var/www/joomla/tmp/bfsurvey. Then, click on the Install button.