It took quite a while (the driver had to be compiled, but all was automated), but after it finished, I restarted the Pi and the Wifi stick worked perfectly. Then you have two Wifi devices in your Pi, wlan0 = builtin Wifi and wlan1 = BrosTrend stick.
Opsss, i installed first the b option (to install the 88x2bu driver for the ACL1 or ACL3 versión 2 models). Non errors showed. Restar the pi and I continúe only with 1 wifi device....
Then I tried to install option a (to install the 88x2bu driver for the ACL1 or ACL3 versión 2 models) with the same result, 1 only wifi device....