Converter currently fixed - Further updates

Converter is currently working. Fixed were implemented and I am closely monitoring the situation for any potential errors that might occur.

Further, a new UI will soon be released with new functionalities that many of you have requested (Cancel button, Option to choose if you want to download the whole playlist or only single video (amp3, am4a), and video cropping).

I also work to make 2k and 4k videos available to download.