NaN on download attempt

Have been using the extention for a while. Today I find every attempt to download from YouTube is stopped with 'NaN' in the box next to the Download button. I've had this before but was able to try and try again until it worked, now I get 'NaN' every time. 
Samples:
https://www.youtube.com/watch?v=NNEgUPKxk7A
https://www.youtube.com/watch?v=VODiDl8k3Sc
https://www.youtube.com/watch?v=VgSIH4QKLUY
and many more
I have downloaded and installed the script fresh, I am running Version 85.0.4160.1 (Official Build) canary-dcheck (32-bit) of Google Chrome