Digital forensics is a very complex field. This means that you are likely to face different problems while working on your cases. Problems may be of different natures: you could fail to install a tool because your workstation doesn't have additional third-party software (usually it's included in the package by the developers); you could fail to process the data source properly because it's damaged or the format or file system is unsupported; you could fail to parse some forensic artifacts because their format has been changed and isn't supported by your piece of software yet, and so on.
Thanks to the developers of commercial forensic software, including EnCase, FTK, AXIOM, Evidence Center, Intella, and so on, you can solve almost any problem quickly and easily (most of the time) with the help of their customer support services...