I cannot open the Wigitsmith app

i am on ios14. i got wigitsmith to edit my home screen. i can not open the app. every time i try to open it it immediately kicks me out of the app. i’ve tried deleting the app and restarting my phone but it still does the same thing. can someone tell me what to do? do i downgrade to ios 13?

[Re-Titled by Moderator]