Downloading crack files from unknown sources poses substantial risks. Security researchers consistently find that CAD software cracks frequently contain:

Beyond the crack itself, even the files you work on can become weapons. Malformed DWG files designed to overflow buffers with executable code are a more sophisticated type of attack designed to make doctored drawing data run as code on your computer. If you are using a cracked version without legitimate security patches, you have no protection against these exploits.

Each of these tools is completely safe, free from malware, and legal to use. They are maintained by active developer communities and receive regular updates.

If you are evaluating CAD software for your workflow, let me know: What is your for software licensing?