It might be a storage space issue. Android requires that you have 2-3 times as much storage space available as the app itself requires to install it. So you'll need at least 5GB storage space free on your phone to install CK.
that’s what I thought at first too, but I have like 30ish free
This has been happening to me very often with all itch.io games on my tablet. I just wait and try again in like 5 minutes and eventually it works.
