Hey all!
Due to an issue with our Apple Developer Program account, StosVPN was removed from the App Store.
Those with StosVPN still installed can continue to use it, but uninstalling it means permanently removing it.
In the meantime, you can use StikDebug as the VPN app for SideStore.
It is available on the App Store for everywhere but the EU and China.
EU Residents should use AltStore PAL and install it that way.
Chinese Residents should make an Apple ID under a different country to use.