If you have Safari set to ask you where to save a file each time you download it, but it isn't asking, you are not alone. Here are two ways to work around this bug.
You can also watch this video at YouTube (but with ads).
Here’s the Terminal line:
defaults write com.apple.Safari.SandboxBroker AlwaysPromptForDownloadFolder -bool true
Thanks bunches
In the video you mentioned you would have a copy of the code here. I can't seem to find it.
Eric: I've added it above.