Vendors like Simply Modbus rely on license fees to fund development, patch protocol updates, and provide support. Because the market for Modbus testing tools is relatively small compared to general consumer software, the price per license is often higher to sustain the business, incentivizing users to seek cracked versions.
Recent versions have moved to .lic files. The vendor will email you a file. Save it to the installation folder, then use File -> Load License . Simply Modbus Tcp Client License Key
Simply Modbus TCP Client is a Windows application used to test and communicate with Modbus TCP servers (slaves). The product is distributed as shareware: a free trial is available, and continued use requires purchasing a license key (registration code) from the vendor to unlock the full, licensed version. Vendors like Simply Modbus rely on license fees
⚠️ Important: The license is to the PC’s hardware ID (derived from the hard drive and network adapter). You cannot share it across multiple computers without purchasing additional licenses. The vendor will email you a file