The legacy V-Control Pro 1.9 iPad app is no longer available for purchase on the App Store. It has been replaced by the V-Console app for use with V-Control Pro 2, which is completely new system.
Apple does not allow existing app owners to download V-Control Pro 1.9 since it is not on the App Store. Apple requires app owners to save backups to access their apps that are no longer in the App Store. This is how Apple’s App Store works and is obviously very inconvenient. We wish they had a better system!
You must backup V-Control Pro 1.9 on your device according to Apple’s backup instructions:
Apple Support – How to back up your iPhone, iPad, and iPod touch
And Apple has instructions to transfer data to new devices:
Apple Support – Transfer data from your previous iOS or iPadOS device to your new iPhone, iPad, or iPod touch