Ive been using this addons for very long time. Last time i had no issue with the downloads. But recently im facing issue whereby it says "Unknown time left" and then proceed to failed. I had tried many things. Blocking of firewall, restart my adapter, reinstalling firefox and addons, adjust the download settings and many more. But seems like it keep prompting this error. At first the download speed increase. Then it gets slowly and stopped. I had to click the retry button over and over again countless time just hoping it would work.