failed

All lines of software from 4K Video Downloader to 4K Youtube to MP3 have major operational issues on Mac:

(1) The feature that is suppose to allow to download an entire youtube channel almost invariably fail. Only a few files gets downloaded and in random order. The rest of the files in the list eventually display the error message Failed to Download. Forcing failed downloads won't work.

(2) When quitting the app, instead of the failed items to remain in the list, everything gets deleted. You are greeted with an empty list and any effort that was made to paste the titles earlier are totally wasted.

(3) Also multiple selection of files and choosing remove removes all files in the list instead of the ones chosen.

(4) When re-downloading a long list of files form a channel in a situation where only some have been downloaded earlier, you receive no warning of the files that you might have already downloaded fully or partially before having received a failed download error. A duplicate download detector is a must so when you re-paste a youtube channel, a playlist or a link to a youtube title, the software can only focus on the titles not already downloaded or prompt a warning saying you have already downloaded this item.

(5) Even though when you specify to download 1 at a time, the software still downloads 3 to 4 and sometimes even more streams.