If Supertone Air is not showing up as a plug-in in Pro Tools for you, there may be two reasons.
1) If you are running Pro Tools in Rosetta mode, download the macOS (Intel) installer and it should show up.
2) We have seen that Air is not recognized as a 64-bit plug-in in macOS 10.13 - 10.15. We are currently working on fixing this issue for the next update.
Fixed:
3) If you have the Sound Particles Air plug-in installed, Supertone Air will fail to show up as a plug-in because they have the same name. This issue was fixed in v1.0.1 of Supertone Air. For issues that result from this update, please check out this article.