C64 Ultimate Toolbox 2.0 is a major update with powerful new features:

- File Manager: Browse, upload, download, rename, and delete files on your device. Create D64, D71, D81, and DNP disk images. Mount and unmount drives. Drag and drop files from Finder.
- BASIC Scratchpad: Write Commodore BASIC programs on your Mac and send them directly to your C64U. Includes sample programs to get started.
- Remote Monitor: Interactive debug monitor for reading/writing memory and inspecting machine state.
- Auto Device Discovery: Automatically scans your network every 5 seconds to find Ultimate devices. Shows service status and password requirements at a glance.
- MOD File Support: Load and play MOD tracker files on your device.
- Disk Image Mounting: Mount D64, D71, D81, and DNP images to device drives directly from the file manager.
- Improved Connection Flow: Password-protected devices are now discovered and handled gracefully with a password prompt. Saved passwords are tried automatically.
- Stream Error Handling: Clear error messages when streams can't start (e.g., device not on Ethernet).
- Redesigned Open Device screen with help text and streamlined layout.
- Rewritten in pure AppKit for better macOS integration.
- Numerous UI improvements and bug fixes.