As a .part3.rar file, it cannot be used alone. You must have all preceding and subsequent parts (e.g., part1.rar , part2.rar ) in the same folder to extract the full software.
The file is the third part of a multi-volume compressed archive for a high-quality piano sample library or digital instrument. Core Features of the Archive Liszt_Legends_v1.part3.rar
If you get a "checksum error," it often means part3.rar is corrupted and needs to be re-downloaded. As a .part3.rar file