Many modern Bluetooth 5.0 dongles (from brands like TP-Link, ASUS, or Plugable) come with a bundled on a mini-CD. The serial number is printed on the CD sleeve. This is often cheaper ($10-$15) than buying a standalone software license ($29.95).
If you need a for software you already purchased but lost, contact IVT support or check your email history. If you’re looking for a free way to use BlueSoleil, that doesn’t exist legally — consider switching to the built‑in Windows driver. bluesoleil serial number
How to find product Serial Number and Check Number | Official Support Many modern Bluetooth 5