Before taking any steps, please make sure you have the latest version of mbt Streamer installed. You can find the latest version of the Streamer on our website, in the Download section.
If you are not able to view any signals, try running the Streamer as an administrator (right-click on the app and click "Run as administrator"). Also, try disabling Windows Firewall as this may cause problems with the LSL stream.
If the Streamer does not start the stream when the "Start streaming" button is pressed, try downloading the Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019 from here. After installation, run the Streamer again and the stream should start this time. Please make sure that the Java version is the same as Microsoft Visual C++ Redistributable (i.e. both are 64-bit).
If these steps don't solve the issue, feel free to contact the support team at support@mbraintrain.com or submit a request.