Hi Kenichi,
thank you for your email! I am glad that you have used CalenGoo for years! 😊
You are talking about the desktop version (for Windows, macOS and Linux), not the iOS version, right? There is already a special version for Apple Silicon chipsets that you can download from my website
https://www.calengoo.com/desktop . It is called "CalenGoo macOS (M1/M2 arm64)" and can be found near the end of the page. Can you see it there? Just install that version if you have an Apple Silicon computer. It will also be faster then.
Please don't hesitate to contact me again if you have further questions!
Kind regards
Dominique