Starting from August 31st, 2023, Infinity will be a subscription-only app due to Reddit API changes enforced since July 1st. The announcement from Reddit can be found here: https://www.reddit.com/r/reddit/comments/145bram/addressing_the_community_about_changes_to_our_api
You can learn more about the changes in this post: https://www.reddit.com/r/Infinity_For_Reddit/comments/147bhsg/the_future_of_infinity
It's required for you to update Infinity after August 30th so that you will get the new version with subscription options. None of the previous versions (including this one) will work after August 31st. Thank you for your understanding!