My certificate will expire in 4 days, and I've uploaded for submission new app version with the new certificate. What happens if the old certificate expires? Will users be available do download my app with old certificate, or will Apple remove my app until the new certificate is provided?
When the Distribution Certificate expires, it has no impact on the existing users of your app or on the version of the app that is currently published in the store. The Distribution Certificate must be renewed before compiling or uploading the next version of your app to App Store Connect.
A distribution certificate is valid for one year from date of issue. After it expires, you won't be able sign and install apps on your devices although this will not affect any existing apps in the App Store. To continue distribution, navigate to the Devices organizer in Xcode.
With expired certificates, the website remains down for a long period of time, and it will be until you renew your certificates or purchase new ones.
What happens if my certificate expires or has been revoked?
Apple Push Notification Service Certificate
You can no longer send push notifications to your app.
Pass Type ID Certificate (Passbook)
If your certificate expires, passes that are already installed on users' devices will continue to function normally. However, you will no longer be able to sign new passes or send updates to existing passes. If your certificate has been revoked, your passes will no longer function properly.
iOS Distribution Certificate (App Store)
If your iOS Developer Program membership is valid, your existing apps on the App Store will not be affected. However, you will no longer be able to submit new apps or updates to the App Store.
iOS Distribution Certificate (In-house, Internal Use Apps)
Users will no longer be able to run apps that have been signed with this certificate. You must distribute a new version of your app that is signed with a new certificate.
Mac App Distribution Certificate and Mac Installer Distribution Certificate (Mac App Store)
If your Mac Developer Program membership is valid, your existing apps on the Mac App Store will not be affected. However, you will no longer be able to submit new apps or updates to the Mac App Store.
Developer ID Application Certificate and Developer ID Installer Certificate (Mac Applications)
If your certificate expires, users can still download, install, and run versions of your Mac applications that were signed with this certificate. However, you will need a new certificate to sign updates and new applications. If your certificate has been revoked, users will no longer be able to install applications that have been signed with this certificate.
Original Source Apple Doc
When distribution certificate expires, you can't submit new apps to AppStore. On the other hand the old live apps will work fine, ie: Nothing will happen to your live app in AppStore.
Consider check these Apple's thread and doc.
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