If you are running a SCADA system (like FactoryTalk View SE), connecting to an Excel spreadsheet for data logging via DDE/OPC, or developing custom software to talk to a PLC, you need the Gateway edition.
If your support contract has expired, the download button may be greyed out. In that case, you must renew your contract or use an alternative (see section 3). rslinx classic gateway download
To get the Gateway edition, you typically follow the standard RSLinx download path but require a valid serial number for full activation. Downloading RSLinx Classic Software With a Serial Number If you are running a SCADA system (like