Updates not updating
At east the latest one won't. First attempt produced a message saying update had not been installed due to unspecified error. Second attempt produced message saying installer couldn't extract the update. I've chosen to skip this update, so hope there was nothing important in it.
Open in Explorer addressbar %TEMP% and delete all content in this folder. Try to update once more.
Which Windows do you use? From which Vivaldi you wanted to update to which newer?