I feel surprise you are asking such a question. May I ask...what do you think the difference between a setup program and a iso in installation? or...Keep the setup program in a USB than to burn the iso in a DVD?Let me tell you ...both can upgrade your old windows to win8 Pro.
有些人在升級過程中錯過了選取下載iso檔作backup,本標題目的是提供一個方法給這些人拿回win8 升級program 的backup,這個方法是免費的,當然你亦可以選擇付錢訂購DVD的,適隨尊便。
有時不是cd key的問題,例如有人upgrade時沒有選擇下載ISO檔,事後想要番隻碟將來重裝Win 8 Pro,我剛剛就洗機機重裝了一次Win 8 Pro with same cd key,activate左無問題。
另一例子是有人upgrade 時以32bit windows 申請,結果下載了32bit 的ISO檔,但事後改變主意,想upgrade另一部64bit的Win 7電腦上64bit Win 8 Pro,32bit舊win那部放棄upgrade,那麼他便不須要多花$325再為64bit Win 7 申請多一次了。