Easiest fix since you have already tried a updated driver would be to buy one of those USB Bluetooth adapters and see if that will fix the issue and not use the built in Bluetooth which failed to work after Windows 10 update.
Only other option is to roll back Windows 10 to earlier state before update and lock it from updates which is dangerous for system security protection by forcing it to not update ever again in favor of the Bluetooth functionality that later version of patched Windows 10 breaks.
I assume Device Manager is happy and no yellow (!) or red (X) for the Bluetooth or other devices on the system?