First time, be gentle - JB HiFi are offering 'Microsoft Windows 8 Pro upgrade' on their website for $11 with free delivery.
Also, Microsoft now recognize any valid activation key from these prior versions ( Windows 7, 8, 8.1) and grant you a "digital entitlement" that lets you clean install Windows 10 using these keys. (http://www.theverge.com/2015/11/15/9738544/windows-10-activa…)
Also available:
* Microsoft Windows 7 Home Premium (Upgrade from Vista) for $11 delivered - https://www.jbhifi.com.au/computers-tablets/software/microso…
* Microsoft Windows 7 Professional (Upgrade from Vista) for $19 delivered - https://www.jbhifi.com.au/computers-tablets/software/microso…
change the main link coming up as this:
"The page you were after lived a good and happy life, but now it is no longer with us. That's ok though, because we have thousands more that are alive and just as great."