First of all, you should get a Skype profile folder. Again, you can use a forensic image, but to save time for testing purposes, we recommend using a profile folder as the data source. You can find Skype profile folders (yes, there can be more than one folder, as multiple accounts can be used on the same device) here:

C:Users\%USERNAME%AppDataRoamingSkype

Once you get it, make sure Belkasoft Evidence Center (valid licence or trial) is installed on your workstation, and we are ready to start.