Though there's no significance difference in visual effect. It mianly optimized the thumbnail generation and also sloved some compatibility issue. If you used to had problem using 1.0 package, try this one.
QuickChm 1.0 Released, check the download page for details
1. Automatically locate a cover image in the CHM archive and display it as a thumbnial
2. Show the 1st page of the CHM archive as preview