Thank you for your question, the version 2.0 is a major update and its core got update to Laravel 6.0
To update, please follow the below steps.
1. Backup your existing website
2. Copy your uploads directory to a separate place, copy database info from
3. Replace all directory files with the new update, replace database info from previous
4. Replace new uploads directory with previous uploads which you copied in step 2.
Congratulation, your files have been updated.