Help/Support Duolingo Load Problem

[Hardile 0]

Hello guys,

I’ve downloaded the app ‘Duolingo’ from the user Laxus from here.

ive sideload them directly to my phone using the ipa file. The app Open and I can click few question (like my name,which language I want to learn...) but as soon I want to start a lesson the app says ‘a issue occur, please try again later or contact the support’.

i see that an other guy in February 16 got the same issue. 
But the issue is still valid. Can someone help me?

i also try to contact Laxus with DM but I don’t find the ‘letter’ symbol. 
many help would be much appreciated.

ive a iPhone 11 pro

ios 13.3

non jailbreak

[Laxus 803.9k iPhone 5s 10.3.3]

Idk what causing this issue tbh it just happen randomly