Alternative to eskyguide
 

For the past few years, I've used eskyguide (aka American Express Traveldesk) as an offline flight connection database under Windows. By that I mean that wherever I was (on a plane, cab, wherever) I could ask what are flight options between X and Y and it suggested the reasonable (1 way) connections. No real-time availability, but super useful to figure out what are alternatives to get from A to B. The user interface was dinosaur-like, but it worked and the underlying database was regularly updated and available for download.

As of last week, it stopped working and refused to update. The website eskyguide.com indicates there was a change of ownership, and there is no sign of the tool anywhere.

Can anyone suggest alternatives? I know there are zillions of online query engines, but I'm looking for something I can download and run offline.

Thanks!

[Apologies if covered elsewhere - did a search with no luck]