I have a not jailbroken Iphone 6s ios 12 and only use Cydia for one app, to occasionally play NBA 2k18, however these days the app won't sideload into my phone no matter what I do. Every time Cydia gets stuck on the last iff file before the "extracting package" stage of the installation, in this case the file is called "worldball.iff". I thought this must mean that the IPA file was at fault however when I tried other IPAs it gave me the same problem. I have changed my Apple id, used older versions of Cydia and even completely restarted my phone but non of these actions worked. And I don't really know if the issue is my iphone, Cydia or the app, I'm at a loss here as to how I can fix this problem. If anyone here knows how to help me, that would be really great.