Downloading TRCUSBFsLink 2.1.1332 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. Commonly, this program's installer has the following filename: TRCUSBFsLink.exe. The actual developer of the free program is TRC Software. The software is categorized as Games. The most popular versions of the program are 2.1 and 1.8.
From the developer:
It contains driver software for the new, more complex USB instruments and connects the instruments to either Microsoft Flight Simulator 2004 (FS9) using FSUIPC3.xx or directly to Microsoft FSX using Microsoft's Simconnect (automatic recognition of Flight Simulator version).
You may want to check out more software, such as POLUtils, rFactor Ignition or TibiaTek Bot, which might be related to TRCUSBFsLink.