I really liked the app but now it wont work!!

I really like this app I use it to make literally all of my edits so if u make edits regularly then this is the app, but recently it has been messing up and it wont allow me to download ANY of the YouTube videos I want, PLZ FIX THIS GLITCH Thanks!

CUPCAKE STELER about VidLab・Video Editor & Overlay, v1.15