Marc P.:Ideally purchased content will be available upon re-entering the keys for them on a freshly installed Studio on a different computer.
"Ideally, purchased content will be available............................. on a different computer", but it's not.
When you install on a different computer, your passport number changes and none of your previous keys, that you purchased under one passport, will work under a new passport. (Did that make sense?)
This is the reason for backing up your pixie folder. Your passport number will stay the same and all of your keys will work.
I've had the same passport number since the very early days of S10.
If you do it right (the pixie folder, I mean), you won't even need to enter any of your keys, they'll all be loaded already upon first startup of studio.