You can try following methods to solve the problem.

1. Check the network and make sure the network is working well
2. Close security software
3. Set the output folder to another drive other than C drive
4. Try other download methods, there are 3 ways of downloading, paste URL, Detect (download from the embedded browser), Advanced Detect (download from PC browser)
5. Set to other download formats by navigating to “Settings> Format”.
6. If the above methods cannot solve the problem, the software also supports recording, try to record instead of download.