If you can't see the scope screen like the below image, your graphics card's driver may not be up to date. You need to download and install the latest version of the graphics card driver to fix the problem.
Open the Device Manager.
Under the View Menu, click Show hidden devices.
Expand Universal Serial Bus devices.
Normally, you should see "Minis" under the Universal Serial Bus devices.
If you cannot find them there, you need to install the drivers manually.
Go to the installation folder of the Minis. If you did not change the default location, it is "C:\Program Files (x86)\Compocket\Minis".
Open Drivers folder.
If you do not have Minis.cat files, Run dpscat.exe first. This creates the necessary .cat files.
Run dpinst32.exe or dpinst64.exe according to your OS. This will install the drivers.
You need to make sure that you have the permission to access the USB as the current user.
You need to make sure that you have the Minis.kext file to communicate with the device.
The .kext file should be located at /System/Library/Extensions.
AC coupling is managed by software. If the device is in real-time mode, the AC coupling is not functional. That's why you see the offset.