: If you have an existing license for an older version (like Simply Modbus Slave 2.1), newer versions (like Slave 7.1 or 8.0) will typically detect and use it automatically if already installed on the PC.

: $114 for a combination of two tools (e.g., Master and Slave). Bundle (All 3 Programs) : $162 for the complete suite. Multi-User & Site Licenses :