A macOS bug may cause DropDMG 3.7 to crash at launch on macOS Tahoe 26 if you had previously used DropDMG with a smaller size for the main window. If this happens, you can reset the window size by entering this command in the Terminal app:
defaults delete com.c-command.DropDMG "NSWindow Frame MainWindow"
and pressing Return. Once you relaunch DropDMG, you can make the window smaller again if you want. It’s best to resize the window slowly to avoid triggering the crash again.