Hi again, littlegal100!
So I tried to update the Steam game build with the Walkthrough DLC (to test before preparing to publish), there's an error with the SMS authentication message... I didn't receive any message & when I kept trying, I seem to hit a rate limit from making too many attempts in a short period. Steam support said I need to wait for the cooldown period to finish, I don't know how long, so I think it'll take a while until I can release the Walkthrough DLC :'(
I'm crossing my fingers! Steam has become more strict--I hope you can wait. If not, I hope you'll be able to solve the issue with PayPal & go with the itch.io version!
xoxo,
SweetChiel