Prevent download of Links from an Assembly when a Part fails.
|Target version:||040 - FarfarAway|
If Mirror-sets within an Assembly are known, then if one of the mirror-sets cannot be downloaded (and doesn't already exist), stop downloading other links until the user indicates to continue or the Assembly becomes completable again (user added Links).
Note: An individual Link is also considered a Mirror-Set for this purpose.
Note: A place-holder file (*.p?? for rar archives) satisfies a mirror set, but place-holders should be downloaded after other mirrors.