Hello @Sheyk2022, as recommended multiple times, I would really, really suggest you update to the latest 5.x version for being able to publish to App Stores. You will not be able to release apps with SIS 4.3.7 or lower due to the requirement of Unity IAP 4.4.0+. If you've bought SIS on the Unity Asset Store, there is no way to download older versions. I do not distribute the asset via email manually or by other means. If you've bought it on my website, you have access to version control (see all code differences between versions) and also download all older versions down to 4.3.7.