Sogcyp,
The locking device is the USB key or MUD (multipurpose USB device) as we call it. The MUD must be plugged into the machine under test. The MUD must remain in the unit while testing is under progress or you will get a licensing error.
Make sure your BIOS is set to use USB devices, setting up the devices so USB devices are bootable is handy as the MUD is a bootable device and contains the DOS product. This way you don’t even have to use the CD, at least for DOS. The Windows product also requires the MUB to be present to operate.
The manual is a PDF file located on the distribution CD. Copy it to a handy place or print it out for easy reference.
Thank you for purchasing PC-Doctor and welcome to the group.
-Fred