I'm sorry that you're experiencing problems with our Sync application.
What happens when you run the doubleTwist program? Do the doubleTwist window and menus appear before it crashes?
Have you tried a library reset?https://www.doubletwist.com/help/question/how-to-reset-the-database-in-doubletwist-sync/
If after the reset, our Sync application is still not launching on your PC, the application may contain more information. It's located here:
C:\Users\[YOUR_USERNAME]\Appdata\Local\doubletwist Corporation\doubleTwist Desktop\Log\
For a shortcut to the "doubleTwist Corporation" directory, please paste this into a File Explorer window (this will also work on systems that do not have the view hidden folders option enabled). Then navigate into "doubleTwist Desktop" and then into "Log".
Please post the last ~50 lines of the log.