The dead computer won’t be active again, so it doesn’t have an active installation/PC. The license can be used multiple times so long as there are no other active installations (e.g. getting virus definitions updates, etc.).

The installation and use of the license on another system doesn’t deactivate other systems that it is installed on.

Use of the resend license isn’t mandatory only as I said “If you don’t have a copy of the license file” on USB, etc. then you wouldn’t have other options.

Getting the license resent shouldn’t take a week and a half, that is an exception rather than the rule. If it finds the record of your license (given the information entered in the form) then it should be sent almost immediately.