If you need specific installation instructions, the ManualsLib SND 3600 D3 Guide provides step-by-step software setup details.
The is essentially a phantom search. The device is firmware-driven, not software-driven. If your unit works, enjoy it. If it doesn’t, the problem is almost certainly your source device’s Bluetooth stack, a physical cable, or the need for a factory reset (unplug for 10 minutes). Silvercrest Snd 3600 D3 Software Download
Lidl maintains a hidden support page for Silvercrest electronics. If you need specific installation instructions