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this a youtube partner's video. we can't get download links or it.
what is your current version of the extension?
If you report an error

Please specify additional data:

address of the page (URL) from where you try to download the file,
links or messages displayed by our website.
If you report an error of extension, please also specify:

version of your browser,
version of the extension.
We've fixed the bug in extension ver. 1.49, please update manually or wait for auto-updating
Try to use opera mobile or mini. It should be working fine
Audio support will be added soon.
We are currently working on this feature. [almost ready]