Hi there, @Supanut. I agree with Fiat about QuickBooks Desktop 2019 is no longer supported.

I'm here to help you with what you can do to fix this issue. But first, I'd like to know if you've encountered any error messages. If yes, you can share it in the comment section so that we can check a specific resolution.

However, if there are no errors, let's find out why your QuickBooks Desktop program crashes, You may refer to the possible reasons below:

• The company name may be too long.
• A damaged or missing QBWUSER.INI file.
• A corrupt hard drive.
• The program files or QuickBooks Desktop installation may be damaged.
• A damaged Windows operating system.
• Windows OS needs to be updated.

Also, you need to check if your computer meets the system requirements needed to run QuickBooks Desktop 2019. This is to ensure that it's compatible with the program. If it meets the system requirements and the program is still crashing, I'd recommend updating QuickBooks and restarting the computer. Then, try installing the supported versions to see if you're getting the same issue. 

For additional information resolving date damages, consider checking out this article: Fix data damage on your QuickBooks Desktop company file.

Please leave a comment in this thread if you have any additional questions. I want to make sure everything is taken care of for you. I'll be here to help. Have a good one!