Revert to previous version on App Store

[govaba]

I bought GrassGames Cribbage from the Apple App Store and have been using 4.230. For various reasons I don't like version 5 and want to remain on 4.230. I can't find any way to prevent upgrading Cribbage unless I turn off ALL automatic updates from the App Store, which I don't want to do. In retrospect it would have been better if I had bought off your website, then I could manually choose to install the upgrades or not. How can I solve this? Can I somehow convert my App Store version to a website download version or would I be forced to buy a new license from the website? No idea what that would cost though because there are no prices listed.