Most legitimate old Flash content has been migrated to safer platforms. If you just stumbled on this URL, it’s best to skip it.
To avoid the risks associated with https- free.flash-files.com downloadfile.php and other unofficial file download platforms, users should follow best practices for safe file downloading: https- free.flash-files.com downloadfile.php
If your interest is less about software algorithms and more about the physical hardware file management (how the downloadfile.php actually retrieves bits from a NAND chip), a better paper would be: Most legitimate old Flash content has been migrated