Many cracked files contain malware, keyloggers, or adware that can compromise your Mac’s security and your personal data.
The creator of NLP is very active in the community. Buying the software gives you access to updates and help if something goes wrong with your conversions. How to Get Negative Lab Pro for Free (Legally) Negative Lab Pro Crack -FREE- Mac
It’s tempting to look for free versions of premium plugins, but "cracks" for Mac software often come with significant risks: Many cracked files contain malware, keyloggers, or adware
You can manually invert your curves in Lightroom or Photoshop, though it takes much more time to get the colors right. How to Get Negative Lab Pro for Free
The developer offers a so you can see if it fits your workflow before spending any money:
An open-source RAW editor that has a "negado" module specifically for inverting film negatives.