Also,
If you want to use the PRO features for free when connecting to your friend's PC, ask them to rename the software (portable version) to:
rustdesk-host=YOUR_IP,key=duq6Bnx3LSp9IKIDlSR4rASnFA6x8yVeea8K2IEhjSk=
Make sure to replace YOUR_IP with your actual IP address (e.g., 80.80.80.80).