Will all files/folders be recoverable from a corrupted partition and logical structure if they appear during the initial scan from the demo disk (assuming the pro version is purchased)?

It depends on how the partition was lost, and if the Master File Table (MFT) was corrupted when the partition info was damaged. Also, if the partition was quick formatted, the original data may show but will not be recovered when the partition is. In that case (quick format on a partition) we recommend using file recovery. It will recover the files to another, healthy partition.