How to renew/re-subscribe a cancelled or refunded subscription

To restore a previously purchased subscription, renew the subscription on Apple's Manage Subscriptions screen (see https://support.apple.com/en-us/HT202039). Tapping the price under the ‘renewal options’ area will prompt you to confirm your intent to renew the subscription. Then, launch the app and choose Restore when prompted for a subscription.

Once you have successfully renewed your subscription using Apple’s subscription management screen *outside* of NIH toolbox, and that screen reports that you have an Active subscription rather than a Canceled subscription, then you can launch NIH Toolbox. NIH Toolbox may automatically detect your subscription 10 seconds after launch, or you might have to tap the Restore button when prompted.  Again, this is only *after* you have put your subscription back into an Active state.
 If you are unsuccessful at getting the subscription management screen in the ‘Manage Subscriptions’ page of your device, you may need to contact Apple and ask them to help you with "renewing a cancelled auto-renewing subscription." This is a renewal issue, not a subscription or purchase issue.  Purchases occur inside the app (NIH Toolbox in this case) while renewals take place outside of the app, per Apple’s support article https://support.apple.com/en-us/HT202039.

Another option is using a different Apple ID to purchase a new subscription, which may be more expedient than working to resolve the persistent Canceled state of your subscription with the Apple ID you’ve been using. This would be the last option and it is one we do not necessarily suggest. If you choose to use a different Apple ID, it will be important to first export your collected data, then delete the NIH Toolbox app from the iPad, followed by logging into the App Store on that iPad using the new Apple ID, then re-downloading NIH Toolbox, and finally purchasing the subscription within the app. This is because even free apps with in-app purchasable subscriptions are connected to the Apple ID used to first download them, and the Apple ID used to download a free app must be the same Apple ID used to purchase a subscription within that app.