Can I use an existing ISO/CD instead of letting Wubi download a new one?
Yes, physical CDs will be detected automatically, pre-downloaded ISOs should be placed in the same folder as Wubi.exe. Please note tha Wubi 8.10 requires the Desktop 8.10 CD/ISO. The DVD and Altrenate CD/ISO will not work. You can find the 8.10 ISO here. If Wubi does not find an appropriate ISO/CD and/or if the ISO/CD is corrupted, it will automatically download a new ISO. It is recommended to let Wubi download the ISO for you.