Requirements
Hills Audio plugins are sold per system. On each product page you choose Windows or Mac before checkout, and that choice is the zip you receive. The other system is not included in that purchase. A license covers two computers on the system you bought.
Windows
64-bit Windows 10 or later. Formats and supported DAWs are listed on the product page for the plugin you buy. After install, restart your DAW so it can rescan plugins. If Windows blocks the installer, choose More info, then Run anyway.
Mac
macOS 11 or later. Formats and supported DAWs are listed on the product page for the plugin you buy. If macOS blocks the installer, use Open Anyway in Security settings, then try again. Restart your DAW after install so the plugin can appear.
Price and billing for each plugin are shown on its product page. After payment, create an account with the checkout email, then download from Account. Sign in inside the plugin with that same email and password. Full install steps are on Downloads.
You need a working internet connection the first time a plugin checks the license on a computer. After that, keep the same Hills Audio login on up to two machines for the system you bought.