Nalaprop version 1.0 is its first full release, and a Universal App, superceding previous beta versions. It should run natively on both Intel and Apple Silicon Macs. As it relies on linguistic features which were only added to macOS in Mojave, this requires Mojave, Catalina or Big Sur.
If you’re running an Intel Mac and have any problems, please let me know. I’ll leave the last Intel-only beta available on the Product Page in case you’d prefer to revert to that.