Hi, is your iPhone 5s Jailbroken or Registered using iSignCloud?
AppAddict App is 64-bit compatible...
BTW, iPhone 5C isn't 64-bit device...
My iphone is Jb with the latest version of pangu 1.2.1, installed appsync from appaddict repo and appaddict+ fresh. Then installed ios app from safari and logged in with my account all successful.
Just now downloaded an update from the app and got the security question if I wish to install and clicked install and then the app should close and start installing but it just stays at the download tab.
I have tried removing all several times now and rebooting and cleaning my device with icleaner pro but nothing seems to work.
Appcake on the other hand installs without any problem.
Only have appsync unified installed from appaddict repo which is the same as the karen's pineapple appsync.
I don't have isigncloud or RMU.
My bad for the 5c
EDIT: Just did a clean restore, jailbreaked again, installed appsync unified, appaddict+, app from safari and it still won't install apps on my 5S.
Please iChroniX check the AppAddict app on iphone 5s, thanks