Hi,
This works for me: Go to “Settings”, “Apps & notifications”, “App Lounge”, “Storage & cache”, “Clear storage”, “Delete app data?”, Ok. Then restart your phone. App Lounge update should now work again 
I have had the same problem for many versions of eos/applounge. It has gotten better for a couple of updates now. So it is getting better at least 
I hope that this helps.