Does the licence key activation keep failing? (DSM add-on only)

You'd need to look at the 'licence failure report' generated after activation fails:

Could not validate license "DesignSpark " in C:\ProgramData\XHEO INC\SharedLicenses\SCtemp.lic.
        An unexpected error occurred while validating.
            Too many instances of the MACAddress component to generate a valid hash.

If you see the line in bold, it means there are an excessive number of hardware components which can be used to generate a machine fingerprint to which the licence key is attached.

Open Windows Device Manager (usually in Control Panel)-> Network Adapters. If at a workplace, you may need your IT admin's help with this.

Do you find multiple 'virtual' adapters listed? These could be used for a VPN connection or a hypervisor (like VMware or VirtualBox). Try disabling the virtual adapters and then open DSM again. Enter your licence key and it should activate.

Also, you could try re-installing your Hypervisor (VMware or VirtualBox) or VPN client and this will remove the redundant adapters.

If you require our support agent to assist with the above, please contact [e-mail] 

with the licence failure report attached.