Files like this are frequently used to distribute trojans, miners, or ransomware that can compromise your computer [1, 2].
You won't receive future bug fixes, the "Slay the Spire 2" teaser content, or easy access to the Steam Workshop , which hosts thousands of excellent community mods [3, 4].
Cracked versions often suffer from crashes or corrupted save files, especially with a game as mechanically deep as this one.
Version is a legitimate update of the game (the "End of 2023" patch), but downloading .rar files from unofficial sources carries significant risks:
[1] reddit.com[2] malwarebytes.com[3] steampowered.com[4] fandom.com
That file name refers to a of Slay the Spire .