Hi,
They were so many changes (NetBeans Platform 8.1 -> 12.3, new Apache POI, removed Batik as it's included in Apache POI, new module used like Flatlaf and dark mode, etc...) that it was easier for me to create a new project than changing the more than 5 years old one.
The main changes are:
- Upgraded NetBeans Platform (12.3) and many libraries
- Dark mode
- Start as Applet
- Improved documentation
Best regards and have fun with it,
Anthony