Cuphead -nsp--the Delicious Last Course Dlc-.rar
The second part of the keyword is ".rar". RAR (Roshal ARchive) is a proprietary archive file format developed by Eugene Roshal. It is similar to a .ZIP file but often provides better compression ratios.
While the keyword suggests a downloaded file, here is the legal and recommended method for 99% of users. Cuphead -NSP--The Delicious Last Course DLC-.rar
The mention of ".rar" suggests you might be looking at a file archive. However, downloading game content through unofficial means, such as torrents or leaky archives, is not recommended. Such methods can lead to malware infections, and they violate the terms of service of most digital storefronts. The second part of the keyword is "