I've been sent this as a gift for renewing Avast. However, I've been sent a Windows version and I have a Mac. How do I contact Avast and ask them to send a Mac version. I've scoured the help pages and can find no way of actually contacting them. Is it a fact that this is not possible? They do have a contact phone number at the bottom of their main page but this is a US number and I'm in Spain. Any help would be appreciated.