I could not figure out how to import sample data while installing a Magento store with SNS Kalins theme.

When trying to install all with Quickstart Installation, I have an error “Fatal error: Out of memory (allocated 50593792) (tried to allocate 29207847 bytes) in /homepages/40/d456965906/htdocs/magento/app/code/core/Mage/Install/Model/Installer/Sample.php on line 126”.
When installing Magento with the method provided by my hosting provider, I don’t have the sample data.