Apple software generally goes straight from the App.

The store downloads and installs, but how to install many apps that can't be put on the shelves? That is, through the corporate signature, you can bypass Apple's review and install it directly on the iOS phone, but this signature will expire. Generally speaking, the signature service providers in the market charge a monthly fee. If it expires, you will not be able to use it. You can renew the fee directly, or you can find a new contract service provider, such as dandelion and micro-diversion.