What is the difference between the personal and the commercial versions of Active@ File Recovery?

The difference is in licensing. You can't use personal version of Active@ File Recovery for business purposes.

What is the difference between the File Recovery DEMO and the commercial versions?

Commercial version of Active@ File Recovery allows file recovery of more than 65kb.

Active@ UNERASER -
a data recovery tool, designed to restore files and directories that have been accidentally deleted or lost.

Active@ Partition Recovery -
a partition undelete tool, designed to recover lost and deleted partitions.

Active@ Boot Disk -
a special bootable CD, designed to allow you to make a data backup, recover lost data, erase data, recover windows passwords.

Active@ KillDisk -
a disk eraser software for secure formatting of hard drives without the possibility of data recovery.

Active@ ZDelete -
your privacy protection tool that prevents undesirable people accessing your privately deleted data.