Hello AmrKar,
Thank you for using Apple Support Communities!
I understand from your post that after updating your Mac to macOS Catalina you are receiving a message saying, "helpermcp will damage your computer you should move it to bin." This is preventing you from opening any applications. I recommend testing the issue while your Mac is in safe mode and/or in a new user account. This will help determine the cause of the issue. The following articles have the steps you will need to test the issue in both safe mode and in a new user account:
Use safe mode to isolate issues with your Mac - Apple Support
How to test an issue in another user account on your Mac - Apple Support
Best Regards.