I was having the same issues as everyone else with the software not working with BetOnline, and I got it to work. Here's how:
1. Download Holdem Indicator from the official website
http://iholdemindicator.com/ (I use a Mac)
2. Download BetOnline Poker Odds Calculator
https://www.betonline.ag/poker/odds-calculator
3. Follow the instructions where you restart your Mac and press Command + R while doing so, so that the Apple logo appears and your computer reboots in Recovery Mode
4. Open the Terminal at the top menu bar and type in the command "csrutil enable --without debug --without fs" and run it
5. Finish restarting Mac
6. Open both Holdem Indicator and BetOnline Poker Odds Calculator so that both programs are open
7. Start BetOnline, join game, the HUDs should work and be tracking cards
This software is not a scam, it just has bugs that prevent it from working and my workaround should cause the program to work.