You can download the full version of the software from the official Negative Lab Pro website.
An open-source RAW editor that has a "negado" module specifically for inverting film negatives.
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)
NLP relies on complex integration with Adobe Lightroom. Cracked versions are notorious for crashing, failing to update, or breaking after a macOS update.
This is the best way to see if the "Lab Colors" and "Frontier/Noritsu" profiles actually improve your film scans. Affordable Alternatives
A powerful Photoshop-based tool for negative conversions.
If you aren't ready to invest in Negative Lab Pro yet, there are other ways to invert film on a Mac: