Ken on Cape,
After reading your post I tried to download the "Operation Early Bird" scenarios and the same thing happened to me - I was redirected to FFG's home page. When I downloaded these scenarios before it was from their old website, so perhaps it's a temporary problem?
On the other hand, these scenarios are now found in the newly released Designer Series Volume I book so perhaps FFG has taken them off their site? The best way to find out is to email FFG directly. In the past they have always answered my questions in a prompt and professional manner (usually within 1-2 days) so don't hesitate to contact them.
I'm sorry I couldn't be of more help. However, I don't want to leave a new ToI player empty-handed so allow me to make one suggestion to get you playing straight away. I've found the three best intro scenarios are fan-made. They are:
1. "Tiger Hunt" by Mike Zebrowski
2. "New Player Scenario 1 - Infantry" by Scott Roberts
3. "New Player Scenario 2 - Vehicles" by Scott Roberts
These three scenarios are easy to set up, balanced and play fast. Tiger Hunt is especially fun, but any of them will teach you the rules before tackling some of the more complex scenarios that come in the base game. I double-checked and all three of these are still downloadable. After you've got the basics under your belt, you might try "Redball Express" by Shane Meehan or "Pavlov's House" by Scott Roberts. Both look like winners.
Have fun gaming!