If you see an error like "ftd2xx.dll was not found" or "Entry Point Not Found," try these steps in order:

The safest and most reliable way to get this file is to download the from the official FTDI Chip website. Official Link: FTDI Chip D2XX Drivers What to download:

Click the link under the column (usually a .setup.exe or a version number) to download the installer.

For most Windows users, look for the row in the table.

Run the installer, and it will automatically place ftd2xx.dll in the correct system folders. 2. Common Errors & How to Fix Them

Sometimes a specific application needs the .dll to be in its own installation folder. You can copy the ftd2xx.dll from C:\Windows\System32 into the folder where the program's .exe file is located.

If you are running a 32-bit application on a 64-bit Windows system, the program might be looking for the 32-bit version of the file. The FTDI driver package usually installs both. 3. For Developers (Programming)