I downloaded the driver directly from Tp-Link's site for this. The BT dongle I bought is version 2. There's at least 3 versions, and I even managed to use the firmware from v3 and it reports Bluetooth 5.4, but I don't really know if it is actually compatible with it since I can't find if a Bluetooth 5.3 device can be updated to 5.4. I also did this in Windows and it worked too so there seems to at least not be an apparent problem.
Is this the correct place to report this or should I report it somewhere else?