If you are looking for the software for legitimate ECU analysis, it is recommended to purchase a license from Fairdell or use legitimate open-source alternatives like or HxD , which are frequently recommended in the tuning community as modern alternatives to HexCmp.
This tool is a lightweight and stable alternative to other editors like HxD or WinHex, specifically optimized for quick "raw" binary analysis. Installation Note: Fairdell HexCmp full - MHH AUTO - Page 1