I am under the impression that Windows 10 will be free until July 29. What does activation mean here?You can try Win 10 for free with a clean install (if you have a spare partition). You don't have to purchase Win 10 until you activate it. Until it's activated, some features are disabled, but I don't know which ones. There is/was no time limit on when you have to activate after installing (this may have changed).
Upgrading from Win 7 to Win 10 is free for a while longer, but if you want to dual boot Win 7 and Win 10 (which would be my case), you need to buy Win 10 (Win 7 is no longer sold). In this case, instead of an upgrade install, a clean install is done, and then you can decide if you want to buy and activate Win 10 after trying it out for a while.I am under the impression that Windows 10 will be free until July 29. What does activation mean here?