Long story short: Bit Rate Throttling extension is reaching the end of support period (Maybe it did, while you are reading this). The support ends on January 14th, 2020. Therefore, the executable file is not available in the official site anymore.
Long story short: Bit Rate Throttling extension is reaching the end of support period (Maybe it did, while you are reading this). The support ends on January 14th, 2020. Therefore, the executable file is not available in the official site anymore.