download the directory
https://drive.google.com/drive/folders/1W9jnEPAa68BQ0PALFMpTq4gPCE-8YnQ7?usp=sharing
in the terminal inside the directory LINUX_DRIVER
$sudo make install INTERFACE=all
for more details and extra configurations LINUX_DRIVER/doc/ English Guide in --> LINUX_DRIVER/doc/Realtek_Linux_Bluetooth_Porting_Guide_English.pdf
Other devices fir bluetooth rtl8761b can also look into https://www.raspberrypi.org/forums/viewtopic.php?t=294634
Ok i just found on amazon the Company has also thankfully posted the link of the drivers
use the following link preferably
https://drive.google.com/drive/folders/1-6NI2-PMbX1wmVb1FYbXblaPvZGdKElD