Downloaded through App+
Not able to open, icon is not showing as well.
I was able to download other app and run it smoothly.
Edit*
Icon is actually showing but not properly. It is showing an icon with no image.
*Another update
tried every single way to install (i.e. AltStore, jailbreaking, even borrow an apple developer program account from my friend.)
all of them failed. I think there could be a bug. I know the developer is busy, just wanting him to know this, I am not rushing so take your time and stay safe