Forex Strategy Trader works via a MetaTrader terminal.
Two files are necessary to be copied in the MetaTrader's folder: MT4-FST Library.dll and MT4-FST Expert.mq4. In normal conditions the installer will copy these files for you. If this operation failed, you have to copy the files manually. Both files are in the program's MetaTrader folder:
Use the right path for the destination files. The MetaTrader folder may differ depending on your broker. Compile the Expert Advisor after starting the MetaTrader terminal.
After install you'll see a confirmation message.