Safe sources:

Despite the lack of a dedicated "Setup.exe" installer from the manufacturer for Windows 10, the operating system actually contains the necessary generic drivers to run this hardware. The most reliable method to activate the device is to force Windows to use its own Bluetooth stack.

stands for ISSC Bluetooth Adapter . ISSC (Integrated System Solution Corp) was a manufacturer of Bluetooth chipsets that were widely used in inexpensive, generic USB Bluetooth dongles sold on eBay and various electronics retailers between 2005 and 2010.