An undo application for Windows has been created by BGG user gurnec. It was originally created for Mansions of Madness but has been modified to work with Descent: Road to Legend and Imperial Assault: Legends of the Alliance. You can find the thread here https://boardgamegeek.com/article/27703380#27703380
I've used it for MoM and it works great.
I've used it for MoM and it works great.