Thanks to all the users that have reported issues regarding dragging files out of the Library after 4.20.1.
If you can’t drag files out of your Library into your favorite music player or your File Explorer, please download the latest FrostWire installer available at our Official Website
Official FrostWire Blog 
I have downloaded the new Frostwire. 4.20.3. When i began using it, it worked just as well as the previous versions but I began receiving a “disk problem” message when I attempted to download a file. It now happens with every file.