One workaround I found was this site Just paste the URL and click the Download link. it will give you the “403 forbidden” page but all you do is click the URL bar and press enter and the download dialog box will pop up and let you download anyway.

Edit: Just tried this site too
Seems to have the same process as above:
1) Paste the video ID number from the end of the URL. (example: 308887921 would be UWW: Robotrek part 4)
2) Press the go button.
3) Click the download link and you’ll get a “403 Forbidden” message.
4) Click/Highlight the URL and press enter or go
5) Download dialog box will appear and let you download.