The current Ulysses version requires iOS/iPadOS 17.0 or later and macOS 13.0 or later. However, if your device does not support this OS version, you can reinstall Ulysses from the App Store. 

The prerequisite for this is that you have had the app installed on this operating system in the past. For example, you can only download Ulysses on an iPhone with an older operating system if the app was installed on an iOS device before. You must also use the same Apple Account as before. If this is the case, please follow the instructions on this Apple support website to reinstall a compatible Ulysses version on your device.

Please note: Since previous Ulysses versions do not include newer features, you may encounter compatibility problems. However, your sheets and groups will sync across devices provided you use the same Apple Account and iCloud Drive is activated.