Thank you for testing! The important part of the testing procedure is this:
1. Manually unregister MPUrlSource.ax in the MPUrlSource folder below the MediaPortal install dir. (Either bei calling regsvr32 /u MPUrlSource.ax on the command line, or opening GraphStudio->Graph->Insert Filter...->select "MediaPortal Url Source Filter"->press Unregister on the right side).
because simply deleting the folder or file is not enough - because the registration will live after that and when the file is put there after install, all is fine.
So my question is: Did you manually unregister the filter?
Thank you very much for confirming the installer fix! Sounds like this way should work better, so the next OnlineVideos version will be less hassle.
The wmv Problem might be related to some other codec problem on your PC - we should not hijack this thread with it