Disclaimer: Boring Video.
Not sure why apple has the option to hide apps from your purchase history??
Why?
Well, they allow you to hide the app, but there’s not option on iphones or ipads to UNHIDE the app from purchase history.
Anyways, if you hid your app from purchase history, you can still install the app.
1. In the appstore, just search for the app. You can "get" the app to reinstall it. It shouldn’t cost you any money to re-install the app since it’s purchased but just hidden.
2. You can go to your account settings and also re-install the app from the hidden apps menu.
The procedure to update apps is the same as above.
Good luck. Again, apple things this isn’t a bug.. but it is. When you have in writing that you can unhide apps, but you can’t.. that’s a bug.