Tvheadend

On my old NAS I used a DVBLink license wich I bought in a bundle with TV Butler.

unfortunately DVB Logic went out ouf service and I can't reactivate my license on the new QNAP NAS (TVS-472XT)

Unfortunately already installation of the qpackage TVHeadend_0.9.8.0_x86_64.qpkg fails due to missing tuner.

I found this post here (https://tvheadend.org/boards/4/topics/43017) where they suggest to stop DVBLink server, but /dev/dvb is not existing

How can I configure my TV Butler stick in my QNAP NAS that TVHeadend recognizes it as tuner?

Thank you for your help!