GBox is a free no jailbreak required re-sign tool for iOS, also a third-party app store.
It can be valid from serval months to one year, depends on luck.
Notice: If the cert be revoked in 30 days, you can get one for free.
using gbox tool you can download many paid apps in free of cost, you can install any ipa file using gbox tool.
Note: Please Don’t Buy If You Don’t Know What Is This!