From: London, Surrey, United Kingdom
I just look at things differently. You can't really "copyright" a scenario per see. A game yes, but a scenario, give me a break. It's public domain, and if they abandoned it, then if someone comes along and tidies it up and actually fixes it so it works properly for a new version then more power to them.
Worse case scenario I can just rename them. I did all the upgrading, updating and TOAW IV fixes from the ground up not to mention the tedious hours spent in recoloring the counters and correcting the documentation.
Its a war game, its a scenario. No worries.
It's not a legal issue but an ethical one. If the designer says no, you can't mod my scenario, then it would seem to be unreasonable to ignore that and then distribute the results.
If, on the other hand, they're uncontactable (which will apply to most designers at this point), then I'd say have at it. Just make sure not to remove their credits from the briefing.
"What did you read at university?"
"War? Huh. What is it good for?"