Hmm that download link doesn't seem to work either.
Can't download!The Download is not at google code anymore, because they do no longer allow that. The official workaround is to put them up on google drive - which is what I did. The Link can be found on the google code project start page on the left side "Releases".
OnlineVideos 1.8.0 is now available. (Changelog in 1st post.)
It is not compatible with MP 1.7 Pre - I will release a version 1.8.1 when no problems with 1.8 are found.