The crack requires you to disable your antivirus. Once inside, the malware writes itself into your Windows Registry. It will survive reboots and can log your keystrokes (stealing DeviantArt login, email, banking info).
There are verified reports from 2023-2024 of "Sai 2 cracks" on art forums being loaded with LockBit or Dharma ransomware. The executable encrypts your project files (your art!) and demands $500 in Bitcoin to unlock them. Paint Tool Sai 2 Free Download Full Version Deviantart
Your computer's security and your art portfolio are worth more than a $50 shortcut. The crack requires you to disable your antivirus