En caso de adquirir el antivirus, en cuantos equipos está autorizada la licencia.
This is a English section, either post in English or use the Spanish section:
https://forum.avast.com/index.php?board=25.0
Depends on which license you bough: there are licenses for 1, 3, 5 machines… When you bought, you choose.
One license for each machine. Although, the license for multiply machines is just one (and the same) file (that you apply to different computers).