After adding the repository, let your package manager refresh its source list.

It's also important to know that you don't necessarily need a jailbreak to install .ipa files. This process, known as "sideloading," has become very popular and allows you to install apps outside of the App Store on a standard iOS device. If jailbreaking isn't for you, consider these alternatives:

Alternatively, you can use a third-party app store like AppSync or Cydia Impactor to install CrackTool4 IPA. Here's a general outline of the steps:

It helps in identifying and patching application binary files, allowing them to run without original DRM (Digital Rights Management).