The most secure and updated way to get the software is through official channels:
Ensure you are using a high-speed USB-C (3.1 Gen 2) or Thunderbolt cable. Check the Port: Use the fastest port available on your Mac. blackmagic disk speed test mac download dmg
Open the application from your Applications folder or Launchpad. Select Your Drive: Settings (gear icon) above the "Start" button and choose Select Target Drive to test external SSDs or specific volumes. Choose Stress Level: The most secure and updated way to get