Bear in mind that if the MC application doesn't return to Qnap, you may still have a workable option. It just depends on whether your Qnap can run a VM - so hardware question such as Qnap model, installed firmware and the installed memory will play a part.
If you have a Windows MC licence only, you might be able to install a Windows Virtual Machine on your Qnap and then load MC onto the VM. The other option is to set up a Linux VM. I've done this and it was not too difficult to do. What I haven't done is the next step of installing MC onto the Linux VM but it would just be a case of following the advice you can find here on Interact.
I've not done the latter step because I've got the packaged MC21 app running on the Qnap and don't have a reason to change.