Strelok Pro updates are restricted due to developer sanctions, making the Huawei AppGallery the primary avenue for Android users, which may require re-purchasing the app via a non-US VPN. iOS users cannot currently update the app and must prevent deletion by disabling "Offload Unused Apps". Detailed instructions and data backup options are available on the official Strelok Pro website Lost the Strelok Pro App - Enfield-Rifles.com
(for airguns and rimfire)