Did you buy on the Apple App Store? When you buy an app on the App Store, you provide your payment details to Apple, which ultimately processes the transaction and offers the app stored on their servers. I don’t have access to your payment details nor to your email or contact information, so I cannot…

Unfortunately I don’t have any control over the app download/update process. The App Store is operated by Apple and the downloaded/updated apps are stored on Apple servers. Apple has an official help article for these issues: https://support.apple.com/en-us/102331 If you end up contacting the Apple Support, they’ll most likely tell you to contact the third-party app…