Calibre

Lack of software updates is a possible reason behind Calibre crash. Keep your developer products up to date by installing the latest updates.

Restarting your computer is a crucial troubleshooting measure that can alleviate numerous common problems. Therefore, it is advisable to restart your computer before modifying any settings related to the software.

Changing Default Programs in Windows

1. To get started, right-click your file, then choose "Open With" and select "Choose Another Application" from the context menu;
2. Choose Calibre from the available applications listed in the pop-up window to set it as the default application to open your file;
3. Be sure to check the "Always use this app" checkbox, and then click "OK" to confirm your selection.

Set default app to open files on Mac

1. Right click or use Control + left click on the desired file to launch the file options menu;
2. Select "Open in application" and click "Other";
3. At the bottom of the window, find the "Enable" menu, where "Recommended Programs" is already selected by default;
4. Within this menu, select "All Programs" and then search for Calibre. Check the box next to "Always open in app" to make it the default program.