Knowing this will help narrow down the search for the correct file.
What is this rar file for? (e.g., a TV box, satellite receiver, software program?)
To ensure you are downloading the correct file safely, you may need to:
What does "TNT" refer to in this context?
Ensure "THRESTAR TS 300 TNT" is correct (e.g., could it be a misprint for a different satellite receiver brand like StarSat or TrueStar ?).