You might think: "My antivirus flagged it, but cracks always get false positives." While it is true that legitimate patches sometimes use obfuscation (packing), 99% of the time, the alert is correct. A file called patch.exe modifying another executable is exactly how viruses behave. By disabling your antivirus to run the crack, you are manually opening the gates to an attacker.
Here is a short story exploring the risks associated with downloading such files. The Midnight Lesson synthesia.9.x-patch.exe download
If you are reading this because you genuinely love learning piano, here are better alternatives to : You might think: "My antivirus flagged it, but