Short answer: Nothing changes for SmartSDR for iOS and macOS users.

FlexRadio introduced a new licensing model with SmartSDR Firmware Version 4, called SmartSDR+. Please refer to FlexRadio for details about the available licenses, included features, and how to purchase them. There are ways to purchase a license even when not using a Windows PC.

A SmartSDR+ license is tied to the radio itself, not to client software such as SmartSDR for macOS or iOS.
This means that if a radio is licensed for certain SmartSDR+ features, the apps can use those features as well.

However, features introduced with SmartSDR+ still need to be implemented separately in SmartSDR for macOS and iOS.
Unlike FlexRadio, I do not charge again for these feature implementations – new SmartSDR+ features are provided in the apps free of charge.

That said, not all features will be available immediately when FlexRadio releases them. Each feature requires development work, and availability will vary. Some features may be ready at or shortly after their FlexRadio release. Some will arrive later through an update. Some may never be implemented if they are impractical or unsuitable for the macOS/iOS platforms.

Several factors influence feasibility. For example, features released under SmartSDR+ Early Access are typically unfinished, may contain issues, and change frequently. Because of this, Early Access features are usually not implemented in the macOS or iOS apps.
On the other hand, some new SmartSDR+ features – such as the Digital Voice Keyer – have been available in the apps from the beginning.

Since you may want to know which SmartSDR+ features are currently supported in the macOS and iOS versions before choosing a license, the app manual contains a maintained and updated list of SmartSDR+ features available in both apps.

The manuals can be opened from inside the apps or from here: https://ham-radio-apps.com/manuals