The Universal download should work for all users. Or you can use the Intel/Apple Silicon downloads for a smaller download/install size if you know which one your Mac has.
NAPS2 on Mac bundles SANE drivers for USB scanners, allowing supported scanners to be used even on new M1/M2 Macs (which normally wouldn't work without manufacturer-provided drivers)
Some lifecycle-related issues should hopefully be fixed (e.g. only being able to scan once)
With "Use predefined settings", TWAIN now uses the built-in NAPS2 progress window, which allows multitasking
TWAIN UI should no longer be visible in console and batch mode
TWAIN should also now support scanning larger images (e.g. 1200dpi) without out-of-memory issues
Upgraded Tesseract to 5.2.0 for OCR
Up to 30% faster OCR performance
Tesseract is now bundled with the NAPS2 download, so no extra download is required (though you still need to download language data if you don't already have it).
PDF import and export have been rewritten to leverage Pdfium
This means better support for importing different kinds of PDFs
In some cases this means much faster import/export
Pdfium is bundled with the NAPS2 download so there is no longer an extra download needed to import non-NAPS2 PDFs
New Crop UI
Minor tweaks to blank page detection
Image list tweaks
Selected images appear with just a blue border
Spacing has been optimized
New automatic image correction functionality (work in progress)
"Document Correction" under the Image menu
Automatic fixing of color calibration, noise, skew, and other common scanning issues
Eventually this will be integrated into profiles
JPEG2000 support for importing/saving images (Mac only for now)
Dropped support for rarely-used image file formats (.emf, .exif, .gif)
Please request if you want this back
NAPS2 on Windows now requires .NET Framework 4.6.2
This means no more support for Windows XP
Windows 7 SP1 is now the minimum requirement
The 64-bit Windows install location is now "Program Files" instead of "Program Files (x86)"
The MSI installer now has separate 64-bit and 32-bit downloads
The AppData format for config.xml and Tesseract files has changed (will be automatically migrated)