I've been in this trade long enough to know the difference between "should be", "has to be true", and "actually is", sadly.
At this point, the files in the pre-download are locked to the host and location they are downloaded to. They cannot be moved or transferred to another host without Registry manipulation. It would be foolhardy to recommend to any number of readers of unknown skill that it is OK for them to risk bricking their PCs by doing so.
This may change once the completer becomes available. We do not know whether or how it will change, and we have no inside information, so we cannot predict anything of the kind, and I won't stick my neck out by saying you will be able to move the files to another host before a developer has said so for the record.